Tris chloride hydrochloride

TRIS(ACETYLACETONATO)SILICON CHLORIDE HYDROCHLORIDE AND SOME DERIVATIVES... 

Tris(2,4-pentanedionato) silicon chloride hydrochloride and some derivatives]... 

An advance received too late to include in the table of this chapter concerned the preparation of four polydepsipeptides by the Rydon group. In this work, L-2-hydroxy-4-methylpentanoic acid was prepared from Leu, depside coupling was induced by DCCI in Py, and polymer formation was initiated by treating an acid chloride hydrochloride with triethylamine. By this means, for e.xample, was prepared poly-(0-Tri-Leu-L-2-hydroxy-4-methylpentanoic acid) which corresponded to a number average molecular weight of 46,000. 

C4H21CI4C0N4O2, trans Dichlorobis(ethylenediamine)cobalt(III) hydrochloride dihydrate, 16, 457 42B, 717 C4H2iCl4CrN402, trans-Dichlorobis(ethylenediamine)chromium(lll) chloride hydrochloride dihydrate, 24, 596 C4H2 aClCoNeOeSa, Tris(ammine)diethylenetriaminecobalt(111) chloride dithionate, 44B, 797... 

Many other glycosides have been subjected to selective chlorination with sulfuryl chloride. Methyl /3-L-arabinopyranoside afforded methyl 4-chloro-4-deoxy-a-D-xylopyranoside 2,3-di(chlorosulfate) in 29% yield, whereas the a-L anomer gave357 methyl 3,4-dichloro-3,4-dideoxy-/3-i)-ribopyranoside 2-(chlorosulfate) (30%). Methyl /3-d-ribopyranoside was converted into methyl 3,4-dichloro-3,4-dideoxy-a-L-arabinopyranoside through the action of pyridine hydrochloride on its 2,3,4-tri(chlorosulfate).358 Methyl a-D-lyxopyranoside gave only the 2,3,4-tri(chlorosulfate),353 as would be expected from the disposition of its hydroxyl groups, similar to that in the rhamno- and manno-pyranosides. Methyl a-D-altropyranoside was transformed into the 6-chloro-6-deoxy 2,3,4-tri(chlorosulfate) derivative in 80% yield.353... 

Certain long-chain alkylammonium salts, notably tricaprylmethyl-ammonium chloride (Aliquat 336-S) and tri-Ao-octylamine hydrochloride (TIOA) are liquids, sometimes referred to as liquid anion exchangers, which can form extractable ion pairs or aggregates with anionic metal complexes in the... 

Dining preparation of tris(ketoximino)silanes, two violent explosions attributed to acid-catalysed exothermic rearrangement/decomposition reactions occurred. Although these silane derivatives can be distilled under reduced pressure, the presence of acidic impurities (e.g. 2-butanone oxime hydrochloride, produced during silane preparation) drastically reduces thermal stability. Iron(III) chloride at 500 ppm caused degradation to occur at 150°, and at 2% concentration violent decomposition set in at 50°C. 

Compared with primary and secondary amines, tertiary amines are virtually unreac-tive towards carbenes and it has been demonstrated that they behave as phase-transfer catalysts for the generation of dichlorocarbene from chloroform. For example, tri-n-butylamine and its hydrochloride salt have the same catalytic effect as tetra-n-butylammonium chloride in the generation of dichlorocarbene and its subsequent insertion into the C=C bond of cyclohexene [20]. However, tertiary amines are generally insufficiently basic to deprotonate chloroform and the presence of sodium hydroxide is normally required. The initial reaction of the tertiary amine with chloroform, therefore, appears to be the formation of the A -ylid. This species does not partition between the two phases and cannot be responsible for the insertion reaction of the carbene in the C=C bond. Instead, it has been proposed that it acts as a lipophilic base for the deprotonation of chloroform (Scheme 7.26) to form a dichloromethylammonium ion-pair, which transfers into the organic phase where it decomposes to produce the carbene [21]. 

The direct one-step preparation of 2-acetamido-3,4,6-tri-0-acetyl-2 -deoxy-a-D-glu copyranosyl chloride was reported by Micheel and co-workers,3 and the described procedure is essentially the method of Horton and Wolfrom.4 The product was first prepared through a two-step route from 2-amino-2-deoxy-D-glucose hydrochloride by Baker and co-workers,5 and a number of adaptations of this method have been described6-8... 

Figure 11 Extraction of some divalent meUls and iron(III) (0.10 M as chlorides) from solutions of lithium chloride containing 0.10 M hydrochloric add by 0.50 M solutions of Alamine 336 (commerdal tri-n-octylamine hydrochloride) in xylene at 20 °C...

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