reaction silylene CH3I oxazolidinone unsubstituted oxychloride arenes pulping getName dithiothreitol MgS Kishner BR7 organozinc bromide Biginelli diazo haloform method pyrroles neusis Tartessians Hoceima bromate hydrazines Grignard chlorine hydroxide trifluoride imine mercurous diazonium quinolines HWE disproportionation Meshari AIBN Ligation deoxygenation