Organometallic Complexes of Boroles

Reaction of 1 -(dimethylamino)-2,5-dihydro-2,5-diphenyl- l//-borole with diisopropylaminolithium and then TMEDA gives 293 [90AG(E)317 95JOM (502)67]. 

Aminoborolide dianion [C4H4BN(/-Pr)2] taken as the THF solvate of a lithium salt with Cp MCl3 (M = Zr, Hf) in ether gives 294 (94JA4489). The nitrogen atom 

The most satisfactory route to the synthesis of the iq -borole complexes is the reaction of dihydroboroles (2-borolenes and 3-borolenes) with metal carbonyls. An alternative method of synthesis includes formation of the borole adducts with ammonia, 320 (R = Me, Ph) [87JOM(336)29]. Thermal reaction of 320 (R = Me, Ph) with M(C0)6 (M = Cr, Mo, W) gives 321 (M = Cr, R = Me, Ph M = Mo, W, R = Ph). There are data in favor of the TT-electron delocalization over the borole 

Complex formation with the Wilkinson catalyst RhCl(PPh3)3 gives 351 [870M(319)311]. The reaction with [Rh(in -C2H4)2C1]2 gives the triple-decker 

Organometallic chemistry of pyrrole is characterized by a delicate balance of the t] (N)- and iq -coordination modes. Azacymantrene is an illustration of the considerable nucleophilicity of the heteroatom. However, azaferrocene can be alkylated at C2 and C3 sites. Ruthenium and osmium, rhodium, and iridium chemistry revealed the bridging function of pyrroles, including zwitterionic and pyrrolyne complex formation. The in (CC) coordination of osmium(2+) allows versatile derivatizations of the heteroring. 

---