Conformational analyses of a series of neopentyl-and trimethylsilylmethyl-substituted germyl radicals by electron spin resonance (ESR) were investigated on the basis of the modified cos 2 θ rule. Dimethylneopentylgermyl radical has the conformations with the neopentyl group rotating freely. On the other hand, dimethyl (trimethylsilylmethyl) germyl radical has the preferred conformations with trimethylsilylmethyl group eclipsing with the singly ...