Lithium-carbonate equivalent

The world annual production of hthium metal (expressed as lithium carbonate equivalent) for 1999 is estimated at 87,700 tonnes. FMC s lithium interests are concentrated at its downstream processing facility at Bessemer City, NC, which is fed with Hthium carbonate by SQM and lithium chloride from FMC s brine operation in Argentina. Carbonate and chloride are also processed into chemical applications at FMC s subsidiary in Bromborough in the UK (Lithium Corp. of Europe) and to Naoshima in Japan, where it has a joint venture with Honjo Chemicals. 

C. Sales of various lithium chemicals, million pounds of lithium carbonate equivalents ... 

Five milliliters of lithium citrate syrup contain the equivalent of 8 milliequivalents of Li+. Calculate the equivalent, in terms of milligrams, of lithium carbonate (Li2C03 M.W. = 74) in each 5-mL dose of the syrup. 

Syrup 8 mEq lithium (as citrate equivalent to 300 mg lithium carbonate) per 5 mL (Rx) Various... 

Alkyl alkoxy silanes have been found to be very effective in reducing alkali-aggregate expansion [11] (Fig. 6.4). Of the silanes used in the study, hexyl trimethyl siloxane and decyl trimethoxyl silane were found to be more effective in decreasing the expansion than the others. In the same study, Ohama et al. [11] investigated the effect of sodium silicofluoride, alkyl alkoxy silane, lithium carbonate, lithium fluoride, styrene-butadiene rubber latex and lithium hydroxide on compressive strength and the expansion of mortar containing cement with 2% equivalent Na20. The reduction of the level of expansion shown in Fig. 6.4 with the siloxanes was attributed to... 

Arfwedson prepared lithium acetate, ignited it, and noted the insolubility of the resulting lithium carbonate in water and its action on platinum. He also prepared and studied the bicarbonate, sulfate, nitrate, chloride, tartrate, borate, hydroxide, and a double sulfate which he reported as lithium alum. He mentioned that lithium hydroxide is much less soluble than the other caustic alkalies and that it has a greater saturation capacity [lower equivalent weight] than they. Because of its ability to form deliquescent salts with nitric and hydrochloric acids, Arfwedson recognized the close relation between the new alkali and the alkaline earths, especially magnesia. 

Each 5 mL of syrup for oral administration contains Lithium ion (Li +) 8 mEq (equivalent to amount of lithium in 300 mg of lithium carbonate), alcohol 0.3% v/v. 

Both immediate-release and modified-release formulations of lithium carbonate are available. Peak blood concentrations are lower and occur more slowly with modified-release formulations than with immediate-release formulations, but all formulations are supposed to deliver equivalent amounts of lithium per millimole. The effectiveness of lithium should not be altered by the formulation used or the number of daily doses (assuming full adherence to therapy), but if it is given once a day the 12-hours serum lithium concentration will be somewhat higher than if the same amount is given in divided doses. 

As has been demonstrated, 2-(trimethylsilyl)ethoxymethyl (SEM) esters are selectively removed from amino acids and peptide derivatives in the presence of the most common N- and O-protecting groups applied in peptide chemistry including the urethane-type Boc, Z, Fmoc, and Troc as well as Bzl, tBu, and TBDMS ethers.The SEM ester is removed by acidolysis or with a fluoride ion source, e.g. TBAF in THF or HMPA or with aqueous HF in MeCN (—10°C).f l Deprotection with magnesium bromide in EtjO represents an even milder alternative that allows increased selectivity toward fluoride-labile silyl ethers or Fmoc groups. The SEM esters are prepared in 60-80% yield by stirring a mixture of 0.25 M N-protected amino acids in DMF with 0.8 equivalents of SEM-Cl and 1.1 equivalents of lithium carbonate at room temperature for 16 hours. 

The less highly substituted bond of a siloxycyclopropane is quantitatively opened by mercury(II) acetate to afford -mercurio ketones. In the same pot these are transformed to a-methylene ketones in virtually quantitative yield on treatment with one equivalent of palladium(II) chloride in the presence of lithium chloride and lithium carbonate (2 equiv each). Catalytic amounts of palladium(II) chloride (0.1 equiv) are sufficient in the second step, if two equivalents of copper(II) chloride is added as an oxidant. Mechanistically, the second step involves trans-metalation to a j -palladio ketone followed by /i-hydride elimination. In bicyclic systems it is sometimes necessary to add triethylamine to avoid HPdCl induced double-bond shifts in the reaction product. Examples are the rearrangements of 18, 20 and 22. ... 

FORMULATIONS Most preparations used in the U.S. are tablets or capsules of lithium carbonate. Slow-release preparations of lithium carbonate also are available, as is a liquid preparation of lithium citrate (with 8 mEq of LF, equivalent to 300 mg of carbonate salt, per 5 mL or 1 teaspoonful of citrate liquid). The carbonate salt is favored for tablets and capsules because it is relatively less hygroscopic and less irritating to the gut than other salts, especially the chloride. 

Lithium carbonate (Eskalith) is the most commonly used salt of lithium to treat manic depression. Lithium carbonate dosage forms are labeled in mg and mEq/dosage unit, and lithium citrate (Lithobid) is labeled as mg equivalent to lithium carbonate and mEq/dosage unit. Lithium is effectively used to control and prevent manic episodes in 70 to 80% of those with bipolar disorder as well as to treat other forms of depression. Those who respond to lithium for depression often are those who have not responded to TCAs after several weeks of treatment. When giving lithium in addition to their antidepressants, some of these people have shown significant improvement. 

The original product sold in the United States contains -30% lithium hypochlorite (35% available chlorine), 34% sodium chloride, 20% of potassium and sodium sulfates, 3% lithium chloride, 3% lithium chlorate, 2% lithium hydroxide, 1% lithium carbonate, and the balance is water. It is made from lithium sulfate that is extracted into water from a lithium aluminum silicate ore after it is treated with sulfuric acid. The resulting solution also contains sodium and potassium sulfates. It is neutralized with calcium carbonate to pH 6, treated to remove calcium and magnesium, filtered, and concentrated. Sodium hydroxide is added to convert lithium carbonate to lithium hydroxide. The solution is cooled to 0°C and the resulting sodium carbonate decahydrate crystals are removed by filtration. Slightly more sodium hydroxide than the molar equivalent of lithium hydroxide is then... 

Lithium dose increases administration or prescribing errors (e.g. lithium carbonate and citrate aren t equivalent - have they been confused )... 

The similarity between the cryptands and the first of these molecules is obvious. Compound 7 7 is a urethane equivalent of [2.2.2]-cryptand. The synthesis of 7 7 was accomplished using a diacyl halide and l,10-diaza-18-crown-6 (shown in Eq. 8.13). Since amidic nitrogen inverts less rapidly than a tertiary amine nitrogen, Vogtle and his coworkers who prepared 7 7, analyzed the proton and carbon magnetic resonance spectra to discern differences in conformational preferences. Compound 7 7 was found to form a lithium perchlorate complex. 

Selective hydroxylation with osmium tetroxide (one equivalent in ether-pyridine at 0 ) converts (27) to a solid mixture of stereoisomeric diols (28a) which can be converted to the corresponding secondary monotoluene-sulfonate (28b) by treatment with /7-toluenesulfonyl chloride in methylene dichloride-pyridine and then by pinacol rearrangement in tetrahydrofuran-lithium perchlorate -calcium carbonate into the unconjugated cyclohepte-none (29) in 41-48 % over-all yield from (27). Mild acid-catalyzed hydrolysis of the ketal-ketone (29) removes the ketal more drastic conditions by heating at 100° in 2 hydrochloric acid for 24 hr gives the conjugated diketone (30). 

In an altogether different type of approach, the hydrazone is formed in situ as a lithium salt. Wilson et al. (80JHC389) described this approach in the one-pot synthesis of 5-aryl-2-phenylpyrazol-3-ones 72a-f from the corresponding hydrazones 65a-f (Scheme 20). The latter were obtained by condensing ketones 64a-f with phenylhydrazine. Treatment of hydrazones 65a-f with n-butyllithium in dry THF, followed by the addition of half a molar equivalent of diethyl carbonate 67 and then quenching the reaction mixture with hydrochloric acid, produced pyrazol-3-ones 72a-f, along with products 71. The yields of the products 72 are in the range 22-97%. Four intermediates—66a-f, 68a-f, 69a-f, and 70a-f— were proposed for this reaction. 

Lithium 1,2,4-triazolate with [Rh2( j,-Ph2PCH2PPh2)(CO)2( j.-Cl)]PFj. gives the A-framed complex 177 (L=L = CO) (86IC4597). With one equivalent of terf-butyl isocyanide, substitution of one carbon monoxide ligand takes place to yield 177 (L = CO, L = r-BuNC), whereas two equivalents of rerr-butyl isocyanide lead to the product of complete substitution, 177 (L = L = r-BuNC). The starting complex (L = L = CO) oxidatively adds molecular iodine to give the rhodium(II)-rhodium(II) cationic species 178. 

---