Reactions of [Pd(styrene)(PR3)2], generated from trans-[PdEt2(PR3)2] and styrene, with 2 equiv. of benzyl isocyanate in THF at room-temperature afforded unusual cyclic Pd-tetramers of five-membered rings consisting of organic isocyanate dimers and palladium, [Pd(PR3)–C(O)N(R)C(O)N(R)–}]4 (PR3 = PMe3, 1; PR3 = PMe2Ph, 2). Additionally, a cyclic trimer, (RNCO)3, 3 (R = benzyl) was produced as a catalytic
的反应[
钯(
苯乙烯)(PR 3)2 ],从生成的反式- [PDET 2(PR 3)2 ]和
苯乙烯,与2当量 室温下将
异氰酸苄酯在THF中制得的五元环的非常规环状Pd-四聚体由有机
异氰酸酯二聚体和
钯组成,[Pd(PR 3)– C(O)N(R)C(O)N( R) - }] 4(PR 3 = PME 3,1 ; PR 3 = PME 2 PH,2)。另外,环状三聚体,(RNCO)3,3(R =苄基)作为催化产物产生。用4当量处理环状四聚体(1)。(1,2-双(
二乙基膦基)
乙烷)(
DEPE)或(1,2-双(二
甲基膦基)
乙烷)(
DMPE)等螯合膦容易引起
金属环顺式[Pd N (R)C(O)N(R)C(O)}(P〜P)](P〜P =
DEPE,4 ; P〜P =
DMPE,5)以定量产率计算。相反,Pd(0)-PR 3与2当量的反应。N- CO (Ar = Ph,p - tolyl ,p -ClC