Borylcarbyne complexes: [Mo(≡CBR 2 )(CO) 2 {HB(pzMe 2 ) 3 }] (BR 2 = B(NMe 2 ) 2 , BO 2 C 6 H 4 ; pz = pyrazol-1-yl)

The sequential treatment of [Mo(≡CBr)(CO)2{HB(pzMe 2)3}] (pz = pyrazol-1-yl) with nBuLi and ClBR2 (BR2 = B(NMe2)2, O 2C6H4) in tetrahydrofuran provides the borylcarbyne complexes [Mo(≡CBR2)(CO)2{HB(pzMe 2)3}], in contrast to the reactions of many hal