Potassium bis

Multiplicative Prefixes. The multiplicative prefixes bis, tris, etc., are used with certain anions for indicating stoichiometric proportions when di, tri, etc., have been preempted to designate condensed anions for example, A1K(S04)2 I2H2O, aluminum potassium bis(sulfate) 12-water (recall that disulfate refers to the anion S20jfi. 

BINAP 2,2 -bis(diphenylphosphino)-1,1 -binaphthyl KHMDS potassium bis(trimefhylsilyl)amide... 

Azido-l, 4-benzodiazepin-2-ones 43 arc obtained from 1,4-benzodiazepin-2-ones by treatment with potassium bis(trimethylsilyl)amide, followed by 2,4,6-triisopropylbenzencsulfonyl azide. The azides are reduced to the corresponding amino compounds 44 by the action of triphenyl-phosphane in aqueous tetrahydrofuran. No further details were reported.429... 

Cobalt(III) complexes containing mixed chelating ligands have been produced. Reaction of potassium bis[biuretocobaltate(III)], K2[Co(bi)2] with R2dtc or Rxant at 0° produces (313) the blue-violet [Co(bi)2(S—S)] ion (S—S = R2dtc or RXant). If the reaction is performed above 0° in the presence of water, the products are [Co(bi)2(S—S>2] and biuret. 

Using potassium bis(trimethylsilyl)amide as a solid base, N -isopropyl-l,l-dimethyl-N,N -bis(trimethylsilyl)silanediimine and 2,4-diisopropyl-1,1,3,3-tetramethylcyclodisilazane were formed, accompanied by hexa-methyldisilazane. 

The nitration of the 2,7-diamino-77/-[l,2,4]triazolo[3,4-c][l,2,4]triazolium ion 44 with nitronium tetrafluoroborate affords after workup with base the corresponding potassium bis(iV-nitro imides) 45 <1991IZV1239>. 

An unusual one-pot intramolecular sulfoxide alkylation-elimination reaction was found by Gibson et al. <2001SL712>. These authors found that treatment of 459 with potassium bis-trimethylsilylamide resulted in a ring closure to 460 in acceptable yield. Furthermore, Batori and Messmer found an effective method for preparation of [l,2,3]triazolo[l,5- ]pyrimidinium salts <1994JHC1041> oxidative cyclization of hydrazones 461 by 2,4,4,6-tetrabromo-2,5-cyclohexadienone gave rise to the quaternary salts 462. Under certain reaction conditions, the formation of 6-bromo-salts 462 (R6 = Br) was also experienced. As neither the starting compound nor the quaternary triazolopyridinium salt underwent bromination in this position, the authors assumed that this bromination process occurred on one of the intermediates in the course of the above-mentioned cyclization reaction. 

Bis(trimethylphosphine)nickel(0)-acetylene complex, 3093 Potassium bis(phenylethynyl)palladate(2—), 3699 Potassium bis(phenylethynyl)platinate(2—), 3700 Potassium bis(propynyl)palladate, 2308... 

Potassium bis(propynyl)platinate, 2309 Potassium diethynylpalladate(2—), 1394 Potassium diethynylplatinate(2—), 1395 Potassium hexaethynylcobaltate(4—), 3446 Potassium hexaethynylmanganate(3—), 3448 Potassium tetraethynylnickelate(2—), 2896 Potassium tetraethynylnickelate(4—), 2897 Potassium tetrakis(propynyl)nickelate(4—), 3513... 

General procedure. A solution of potassium bis(trimethylsilyl) amide (0.75 mmol) in THF (0.75 mL) was syringed to a solution of telluronium salt (0.75 mmol) in solvent (6.5 mL) at -78°C under Ng. The mixture was stirred for 2 min, and a solution of a,j8-unsatu-rated compound (0.5 mmol) in solvent (1 mL) was added. The reaction mixture was then allowed to warm to room temperature. After the reaction was completed, usual work-up and flash chromatography gave the pure product. 

The additions of ammonia equivalents, i.e. nitrogen nucleophiles like dibenzylamine (Scheme 27) which are essentially a protected primary amino group, are of special synthetic interest with respect to their possible subsequent chemical transformations. Poorly nucleophilic ammonia equivalents like acetamide or the classical phthalimide, did not add or originally gave low yields of 92a (Scheme 28) [9],but later phthalimide was found to add to 1-Me very well under mild conditions [53]. However, the a-chlorine in 92a could neither be substituted nor could the phthalimido group be cleaved without destroying the cyclopropane ring. The potassium bis(alkoxycarbonyl)amides (Boc)2NK and (Moc)(Boc)NK add to 1-Me in satisfactory yields, but the a-chlorine atom in... 

A formal synthesis of ( )-Eseroline (69) via a 3-aza-4-oxa-Cope rearrangement was reported. An iV-aryl A-hydroxycarbamate was reacted with 2-phenylsulfanylpropanoic acid to yield the O-acylhydroxamic acid derivative 65, R = H that rearranged in the presence of potassium bis(trimethylsilyl)amide. The [3,3] and [3,5] rearrangement products, respectively 66 and 67, were formed (equation 22). If the para-substituted hydroxamic acid 65, R = OCOBu-t is used, no [3,5] rearrangement product is observed and the [3,3] rearrangement product 68 is the only product formed (equation 23). The authors proposed two parallel mechanisms, a concerted pathway and an ionic mechanism by an ion-pair recombination. 

M. Krumpolc, B. G. DeBoer, and J. Rocek, A stable chromium(V) compound. Synthesis, properties and crystal structure of potassium bis(2-hydroxy-2-methylbutyrato)-oxochromate(V) monohydrate, J. Am. Chem. Soc., 100 (1978) 145-153. 

Fluoroanisole Anisole, o-fluoro- (8) Benzene, 1-fluoro-2-methoxy- (9) (321-28-8) Potassium hexamethyidisilylamide Aldrich Potassium-(bis(trimethylsilyl)amide Silanamine, 1,1,1-trimethyl-N-(trimethylsilyl)-, potassium salt (9) (40949-94-8) Isobutyronitrile (8) Propanenitrile, 2-methyl- (9) (78-82-0)... 

The author next tried to stabilize the PGI2 structure by introducing second fluorine atom to the 7-position. However, it had been unknown to make such a difluorovinyl ether unit in the literature. We studied difluorination and Wittig reaction as key steps in the synthetic route of the target difluoro-PGl2 from the Corey lactone. After searching the difluorination reaction, it was found that fluorination with A/-fluorobenzenesulfonimide in the presence of potassium bis(trimethylsilyl) amide and manganese dibromide effectively provided the desired difluoride (Table 7) [106]. 

In the case of the less substituted urea 749, it was necessary to perform a double deprotonation with potassium bis(trimethylsilyl)amide (KHMDS), but ring closure to the quinazolinedione 750 could still be achieved in good yield <2005JHC669>. 

Potassium Bis(oxalato)platinate(II) (2 1) Dihydrate, K2Pt(C204)2-2H20... 

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