sec-Butyllithium598-30-1100 % similar sec-Butylmagnesium chloride15366-08-255 % similar 2-Pentene109-68-237 % similar cis-2-Pentene627-20-337 % similar trans-2-Pentene646-04-837 % similar 3-Hexene592-47-235 % similar 1-Butene106-98-930 % similar Propionaldehyde123-38-630 % similar