Described is a robust platform for the synthesis of a large diversity of novel functional CO2-sourced polymers by exploiting the regiocontrolled ring-opening of α-alkylidene carbonates by various nucleophiles. The reactivity of α-alkylidene carbonates is dictated by the exocyclic olefinic group. The polyaddition of CO2-sourced bis(α-alkylidene carbonate)s (bis-αCCs) with primary and secondary diamines
Boosting the Catalytic Performance of Organic Salts for the Fast and Selective Synthesis of α-Alkylidene Cyclic Carbonates from Carbon Dioxide and Propargylic Alcohols
carboxylative coupling of CO2 with propargylicalcohols is receiving increasing interest but requires the use of catalysts that are most often added in large quantities and/or lack selectivity. Herein, we describe the fine‐tuning of the structure of organocatalysts of the ammonium‐type that enables us to identify the important structural parameters that dictate their catalytic performance. Tetrabutylammonium
Synthesis and Structure of Functionalized Cyclododecadiynes and -dienes
作者:Christoph Boss、Reinhart Keese
DOI:10.1002/hlca.19960790811
日期:1996.12.11
The cyclododecadiynes 3b–d, 8b–d, and 10b–c with functionalities in two propargylic positions, as well as the monofunctionalized diyne 13b have been prepared from simple open-chain building blocks. In the DMPU ( = N,N'-dimethylpropyleneurea)-assisted ring-closing alkylation of 1,7-diynes, the twelve-membered ring compounds have been prepared in yields of 16–55%. The preparation of the diene-diyne 15
Diastereoselective Synthesis of Cyclododeca-1,6-diallenes ( = cyclododeca-l,2,6,7-tetraenes)
作者:Christoph Boss、Reinhart Keese
DOI:10.1002/hlca.19970800207
日期:1997.3.24
The synthesis of substituted cyclododeca-1,6-diallenes.( = cyclododeca-1,2,6,7-tetraenes) from cyclododeca-5,11-diyne-1,4-diols is described (Schemes 1 and 3). The ca. 1:1 mixtures of the stereoisomers of the cyclododeca-1,6-diallenes were formed in high yields from the ca. 1:1 diastereoisomer mixtures of the 1,4-disubstituted cyclododeca-5,11-diynes by reactions with Me2CuLi or t-BuMgCl/CuII. In mechanistically
描述了由环十二烷基5,11-二炔-1,4-二醇合成取代的环十二烷基-1,6-二烯丙基(=环十二烷基-1,2,6,7-四烯)(方案1和3)。的ca。从ca.1中以高收率形成环十二烷基-1,6-二烯丙基的立体异构体的1∶1混合物。通过与Me 2 CuLi或t -BuMgCl / Cu I反应的1,4-二取代的环十二烷基-5,11-二炔的1:1非对映异构体混合物I.在用1,4-二甲基环十二烷基-5,11-二炔-1,4-二醇的纯非对映异构体进行的机械相关实验中,证明了在这些反应中该构型是保守的。仅带有一个炔丙基离去基团的1-取代的环十二烷基-2,8-二炔的首次合成使得能够获得混合的12元艾伦-炔基(方案5)。
A New Class of Hypnotics. Unsaturated Carbinols.<sup>1</sup> Part I
作者:Domenick Papa、Frank J. Villani、Helen F. Ginsberg