( ( metal-carbon bond ) ( homolysis . ) )
(ROOT (S (NP (JJ metal-carbon) (NN bond)) (VP (VBZ homolysis)) (. .)))
metal-carbon bond homolysis.
(ROOT (S (NP (DT The) (JJ metallic) (NN bond)) (VP (VBZ is) (ADJP (JJ responsible) (PP (IN for) (NP (NP (DT the) (NNS properties)) (PP (IN of) (NP (NNS metals))))))) (. .)))