研究了SiH 4,Si 2 H 6和(CH 3)2 SiH 2与B 4 H 10,B 5 H 9和2,3-C 2 B 4 H 8的气相热和放电相互作用,以及(CH 3)2 GeH 2和(CH 3)2 SnH 2与2,3-C 2 B 4 H 8的反应。此外,2,3-C的几种甲硅烷基取代的衍生物2乙4 ħ 8从silylacetylenes和硼氢化合物制备,和它们转化成闭合碳检查-carborane甲硅烷基衍生物。所获得的所有甲硅烷基碳烷均经C取代,在任何研究的反应中均未获得含有SiB键的挥发性产物。获得了GeC 2 B 5 H 7多面体笼系统的甲基衍生物的证据。
Total Synthesis of Bryostatins: The Development of Methodology for the Atom-Economic and Stereoselective Synthesis of the Ring C Subunit
作者:Barry M. Trost、Alison J. Frontier、Oliver R. Thiel、Hanbiao Yang、Guangbin Dong
DOI:10.1002/chem.201002898
日期:2011.8.22
for the stereoselective assembly of the ring C subunit were developed. A Pd‐catalyzed tandem alkyne–alkyne coupling/6‐endo‐dig cyclization sequence was explored and successfully pursued in the synthesis of a dihydropyran ring system. Elaboration of this methodology ultimately led to a concise synthesis of the ring C subunit of bryostatins.
苔藓抑素是一个结构复杂的大环内酯类,表现出异常广泛的生物活性。这些分子的有限可用性和结构复杂性使得开发有效的全合成尤为重要。本文描述了我们对苔藓抑素全合成的初步努力,其中开发了用于环 C 亚基立体选择性组装的化学选择性和原子经济方法。在二氢吡喃环系统的合成中探索并成功地探索了Pd 催化的串联炔 - 炔偶联/6- endo - dig环化序列。这种方法的详细说明最终导致了苔藓抑素环 C 亚基的简明合成。
Pressure-dependent isotope effect in the reaction of silylene (SiH2, 1A1) with acetylene and [2H2]acetylene
作者:Rosa Becerra、H. Monty Frey、Ben P. Masonb、Robin Walsh
DOI:10.1039/c39930001050
日期:——
Direct, time resolved measurements of absolute rate constants for reaction of SiH2(1A1) with C2H2 and C2D2 have revealed a pressure (and temperature) dependent isotope effect characteristic of an association process yielding an intermediate (silirene) which undergoes, amongst other reactions, a degenerate isotopic scrambling process.
Process for preparing acetylene derivative from a ketone compound
申请人:Mitsui Chemicals, Inc.
公开号:US06127583A1
公开(公告)日:2000-10-03
A preparation process of an acetylene derivative comprising reacting a compound having a skeleton represented by the formula (1): ##STR1## in the molecular formula with a compound represented by the formula (2): ##STR2## wherein R.sup.1, R.sup.2 R.sup.3 and R.sup.4 are individually an alkyl group having 1 to 6 carbon atoms and can be the same or different, R.sup.1 and R.sup.3 can bond each other to form a ring, and R.sup.1 and R.sup.2 or R.sup.3 and R.sup.4 can be bond each other to form one or two heterocyclic rings: or with a compound represented by the formula (3): wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same as in the formula (2), and X.sub.1 is a ##STR3## chlorine, bromine or iodine atom.