Trimethylstannylboranes-inverse detection of broad 119Sn NMR signals in solution and solid-state 119Sn cross-polarization magic angle spinning NMR

Extremely broad 119Sn resonances, as the result of 1J(119Sn,11B) scalar coupling, were readily detected, even for diluted samples (5 mg in 0.5 ml of C6D6), via inverse two‐dimensional 1H{119Sn} NMR experiments. Two bis(amino)trimethylstannylboranes and four dialkylaminobis(trimethylstannyl)boranes were studied. The reaction between diisopropylaminobis(trimethylstannyl)borane and trimethoxyborane was monitored by the same technique, leading to the detection of diisopropylaminomethoxytrimethylstannylborane and dimethoxytrimethylstannylborane as reaction products. Crystalline dicyclohexylaminobis(trimethylstannyl)borane was studied by 119Sn CP/MAS NMR. In spite of the proximity of 119Sn to the quadrupolar 11B nucleus, meaningful spectra could be obtained in a short time (≤ 2 h).