( ( Complexes ( of ( CuCl ( with alkenes ) ) ) ) ( ( can ( be ( ( prepared ( by ( reduction ( of CuCl2 ) ) ) ) ( by ( ( sulfur dioxide ) ( in ( ( the presence ) ( of ( ( the alkene ) ( in ( alcohol solution ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Complexes)) (PP (IN of) (NP (NP (NNP CuCl)) (PP (IN with) (NP (NNS alkenes)))))) (VP (MD can) (VP (VB be) (VP (VBN prepared) (PP (IN by) (NP (NP (NN reduction)) (PP (IN of) (NP (NNS CuCl2))))) (PP (IN by) (NP (NP (NN sulfur) (NN dioxide)) (PP (IN in) (NP (NP (DT the) (NN presence)) (PP (IN of) (NP (NP (DT the) (NN alkene)) (PP (IN in) (NP (NN alcohol) (NN solution)))))))))))) (. .)))
Complexes of CuCl with alkenes can be prepared by reduction of CuCl2 by sulfur dioxide in the presence of the alkene in alcohol solution.
(ROOT (S (NP (NNS Alkenes)) (VP (VBP are) (VP (VBN formed) (PP (IN from) (NP (NP (DT an) (NN alcohol)) (SBAR (WHNP (WDT that)) (S (VP (VBZ loses) (NP (NN water))))))))) (. .)))