Chloride ion-catalyzed generation of difluorocarbene for efficient preparation of gem-difluorinated cyclopropenes and cyclopropanes
作者:Fei Wang、Wei Zhang、Jieming Zhu、Huaifeng Li、Kuo-Wei Huang、Jinbo Hu
DOI:10.1039/c0cc04548a
日期:——
A chloride ion-catalyzed generation of difluorocarbene from a relatively non-toxic and inexpensive precursor, Me(3)SiCF(2)Cl (1), under mild and neutral conditions leads to an efficient preparation of gem-difluorocyclopropenes and difluorocyclopropanes through [2 + 1] cycloaddition reactions with alkynes and alkenes, respectively.
Synthesis of gem-Difluorinated Cyclopropanes and Cyclopropenes: Trifluoromethyltrimethylsilane as a Difluorocarbene Source
作者:Fei Wang、Tao Luo、Jinbo Hu、Ying Wang、Hema S. Krishnan、Parag V. Jog、Somesh K. Ganesh、G. K. Surya Prakash、George A. Olah
DOI:10.1002/anie.201101691
日期:2011.7.25
Highly versatile: The Ruppert–Prakash reagent (Me3SiCF3) can be an efficient source of difluorocarbene. By varying the nonmetallic initiator that is used (F− at lower temperatures and I− at higher temperatures), a range of structurally diverse alkenes and alkynes can be converted into the corresponding gem‐difluorinated cyclopropanes and cyclopropenes in good yields (see scheme).
Sodium Bromodifluoroacetate: A Difluorocarbene Source for the Synthesis of gem-Difluorocyclopropanes
作者:Hideki Amii、Kojun Oshiro、Yoshimichi Morimoto
DOI:10.1055/s-0029-1218754
日期:2010.6
As a new difluorocarbenesource, sodium bromodifluoroacetate (BrCF2CO2Na) was found to be effective for high-yielding synthesis of gem-difluorocyclopropanes and gem-difluorocyclopropenes under mild conditions. fluorine - carbenes - cycloaddition - cyclopropanes - cyclopropenes
发现溴二氟乙酸钠(BrCF 2 CO 2 Na)作为一种新的二氟卡宾来源,可在温和条件下有效地高产合成宝石-二氟环丙烷和宝石-二氟环丙烯。 氟-卡宾-环加成-环丙烷-环丙烯
Antifungal compounds and compositions and antifungal use thereof
申请人:——
公开号:US20020035146A1
公开(公告)日:2002-03-21
The present invention relates to the use of certain compounds, known to inhibit the response of plants to ethylene, for the control of phytopathogenic fungi. The compounds are substituted cyclopropenes.
Synthesis of<i>gem</i>-Difluorocyclopropa(e)nes and O<i>-</i>, S<i>-</i>, N<i>-</i>, and P-Difluoromethylated Compounds with TMSCF<sub>2</sub>Br
作者:Lingchun Li、Fei Wang、Chuanfa Ni、Jinbo Hu
DOI:10.1002/anie.201306703
日期:2013.11.18
Two-in-one: Me3 SiCF2 Br is an efficient difluorocarbene source and is compatible with both neutral and aqueous basic conditions. Bromide-ion-initiated [2+1] cycloaddition with alkenes/alkynes and hydroxide ion promoted α-addition with (thio)phenols, (thio)alcohols, sulfinates, heterocyclic amines, and H-phosphine oxides give the corresponding gem-difluorinated compounds with broad functional-group tolerance.