The frustrated Lewis pair tBu3P/B(C6F5)3 (1) readily adds SO2 to yield the zwitterionic adduct tBu3P+–S(O)–OB−(C6F5)3 (3). A series of intramolecular vicinal P/B FLPs Mes2P–(X)–B(C6F5)2 [X = –CH2–CH2– (2a), –CHMe–CH2– (2b), cyclo-C6H10 (5)] add SO2 at −78 °C to yield the corresponding six-membered addition products 4a, 4b, 6. The adducts contain a chiral sulfur center. The [B]–O–(O)S–[P] addition products 3, 4b and 6 were characterized by X-ray diffraction.
受挫路易斯对 tBu3P/B(
C6F5)3 (1) 很容易与 SO2 相加,生成齐聚离子加合物 tBu3P+-S(O)-OB-( )3 (3)。一系列分子内副 P/B FLP Mes2P-(X)-B( )2 [X = -
CH2- - (2a)、-CHMe- - (2b)、环-
C6H10 (5)]在 -78 °C 下与 SO2 加成,生成相应的六元加成产物 4a、4b 和 6。[B]-O-(O)S-[P]加成产物 3、4b 和 6 通过 X 射线衍射进行了表征。