New Derivatives of [NHMe3][7-Me-μ-(9,10-HMeC)-nido-7-CB10H10]

[NHMe 3 ][7-Me-μ-(9,10-HMeC)- nido -7-CB 10 H 10 ] ( 1 ) reacts with [PdCl 2 (PPh 3 ) 2 ] in refluxing ethanol solutions to afford four compounds which are the result of PPh 3 addition. Three of the products are structural isomers, viz. [5-PPh 3 -7-Me-μ-(9,10-HMeC)- nido -7-CB 10 H 9 ] ( 2 ), [6-PPh 3 -7-Me-μ-(9,10-HMeC)- nido -7-CB 10 H 9 ] ( 3 ), and [2-Me-3-{CHMe(PPh 3 )}- closo -2-CB 10 H 9 ] ( 4 ), and the fourth is [7-Me-8-OEt-9-{CHMe(PPh 3 )}- nido -7-CB 10 H 10 ] ( 5 ). The compounds were characterized by NMR spectrometry, high-resolution mass spectrometry, and single-crystal X-ray diffraction studies and are the first derivatives of the “unreactive” [7-R-μ-(9,10-HRC)- nido -7-CB 10 H 10 ] - anion (R = Me) not involving degradation.