Benzocyclopropene reacts smoothly with dibromo- and dichlorocarbene to give the corresponding 7,7-dihalobenzocyclobutene.
苯环丙烯与二溴和二氯卡宾顺利反应,生成相应的7,7-二卤代苯并环丁烯。
Regioselectivity and Mechanism of Dihalocarbene Addition to Benzocyclopropene
作者:Marina Khrapunovich、Ekaterina Zelenova、Lillian Seu、Alexis N. Sabo、Aidan Flaherty、Dina C. Merrer
DOI:10.1021/jo071203+
日期:2007.9.1
regioselectively to aryl-substituted benzocyclopropenes to produce dihalobenzocyclobutenes. The regioselectivity of addition is not due to steric effects but depends on the electronic donor or acceptor ability of the substituent. B3LYP/6-31G* calculations show preferential :CCl2 addition to substituted benzocyclopropene through electrophilic attack on the benzocyclopropene π-system (Ea = 1.1−2.4 kcal/mol)
二卤代卡宾向区域选择性地加成芳基取代的苯并环丙烯,以生产二卤代苯并环丁烯。加成的区域选择性不是由于空间效应,而是取决于取代基的电子给体或受体能力。B3LYP / 6-31G *计算表明:通过对苯并环丙烯π系统的亲电攻击(E a = 1.1-2.4 kcal / mol),CCl 2可优先添加到取代的苯并环丙烯中,而不是将C-Cσ键插入环丙烯基部分中(E a = 5-24 kcal / mol)。π-加成通过一个过渡态选择性地向亚二甲苯中间体或直接向苯并环丁烯产物进行。
POLYMERS, MONOMERS AND METHODS OF FORMING POLYMERS
申请人:Humphries Martin J.
公开号:US20140235800A1
公开(公告)日:2014-08-21
A method of forming a crosslinked polymer comprising the step of reacting a crosslinkable group in the presence of a polymer, wherein: the crosslinkable group comprises a core unit substituted with at least one crosslinkable unit of formula (I): the crosslinkable group is bound to the polymer or is a crosslinkable compound mixed with the polymer; Ar is aryl or heteroaryl which may be unsubstituted or substituted with one or more substituents independently selected from monovalent substituents and a divalent linking group linking the unit of formula (I) to the core unit; and R is independently in each occurrence H, a monovalent substituent or a divalent linking group linking the unit of formula (I) to the core unit, with the proviso that at least one R is not H.
Arylclobutene-containing multi-functional monomers are useful in the preparation of arylcyclobutene-based polymer coatings. Compositions comprising one or more arylclobutene-containing multi-functional monomers and one or more oligomers comprising as polymerized units one or more arylcyclobutene monomer provide arylcyclobutene-based polymer coatings having reduced stress. Such compositions are useful in the manufacture of electronic devices.