20. Alkenes Most intense peaks are often: m/z 41, 55, 69 Rule 4: Double Bond Stabilize M + Rule 5: Double Bond favor Allylic cleavage -Et -29 M + = 112 m/z = 83 CH 2 CH CH + Et Et Me + CH 2 CH CH Et Me CH 2 CH CH + Et Me
24. Hydroxy compounds Loss of largest group - R 3 If R 1 =H m/z 45, 59, 73 … If R 1 =alkyl m/z 59, 73, 87 … M – (H 2 O) – (C1=C2) Alkene - H 2 O - CHR=CHR M – (H 2 O) – (H 2 O)