Lithium acetylides

1,3,2‐Oxazastibinanes: Novel six‐membered heterocycles

“…The triarylantimony dibromides were prepared and purified by the methods reported in the literature [26][27][28][29]. The Mannich base was synthesized and was subjected to sodium borohydride reduction as per literature methods [30][31][32].…”

Amidocarbonylation of alkenes at very low pressures with a Co2(CO)8/SbR3 system: two easy routes to reach N-acetyl-α-aminoacids

“…CO, H 2 were obtained from Matheson and Aga-Gas Inc., respectively, and used without further purification. Two new ligands phenylthienylmesitylstibine (PTMS) and phenyl(phenylethynyl)mesitylstibine (PPEMS) were prepared along with some earlier reported stibines [9] o-and p-tritolylstibine (o-TTS, p-TTS) and p-trifluorophenylstibine (p-TFPS) [10,11].…”

Alkynylaluminum Synthesis Catalyzed by a Zwitterionic Neodymium(III) Heterobimetallic Compound

“…8 These reagents are typically synthesized by the salt elimination of corresponding lithium acetylides and dialkylaluminum chlorides and used in situ (Scheme 1a). 9,10 Routes avoiding salt formation and separation are potentially advantageous; however, the uncatalyzed reactions of terminal alkynes and trialkylaluminums provide mixtures of alkynyl-and vinylaluminums from protonolytic alkane elimination and carboalumination, respectively (Scheme 1b). 11−14 The ratio of products varies with the substituents on both aluminum and terminal alkyne starting materials.…”

“…Organoaluminum alkynyl transfer agents are useful in conjugate additions to α,β-unsaturated ketones, , alkynylation of carbonyls, , and ring opening of epoxides, lactones, and aziridines . These reagents are typically synthesized by the salt elimination of corresponding lithium acetylides and dialkylaluminum chlorides and used in situ (Scheme a). , Routes avoiding salt formation and separation are potentially advantageous; however, the uncatalyzed reactions of terminal alkynes and trialkylaluminums provide mixtures of alkynyl- and vinylaluminums from protonolytic alkane elimination and carboalumination, respectively (Scheme b). − The ratio of products varies with the substituents on both aluminum and terminal alkyne starting materials. In addition, hydroalumination occurs in the combination of Al i Bu 3 and 1-heptyne to give isobutylene and diisobutyl­(1-hepten-1-yl)­aluminum .…”