subsequently synthesized. The relative basicities of the carboranylphosphines were established by (i) measurement of the 1JPSe NMR coupling constant of the selenide and (ii) calculation of the proton affinity of the phosphine, in an attempt to establish which of several factors are the most important in controlling the basicity. It is found that the basicity of the carboranylphosphines is significantly
三个新carboranylphosphines,[1-(1'-闭合碳-1',7'--C 2乙10 ħ 11)-7-PPH 2 -闭合碳-1,7--C 2乙10 ħ 10 ],[1-( 1'-7'-PPH 2 -闭合碳-1',7'--C 2乙10 ħ 10)-7-PPH 2 -闭合碳-1,7--C 2乙10 ħ 10 ]和[1- PPH -(1'- closo -1',2'-C 2 B 10 H 11)}- closo -1,2-C 2制备了B 10 H 11 ],并且由这些化合物和文献化合物的组合,随后合成了八种新的碳
硼烷基膦
硒化物。碳
硼烷基膦的相对碱性是通过(i)测量1 J PSe确定的
硒化物的NMR耦合常数和(ii)计算膦的质子亲和力,以试图确定在控制碱度中最重要的几个因素。发现碳
硼烷基膦的碱性受到P原子上其他取代基的性质,P原子所连接的碳
硼烷笼形顶点(C或B)的性质以及碳
硼烷基膦上