The mechanism and stereochemistry of the addition of olefins to

4146 mi*

Table I. Metastable Peaks from C3H7+ +CaHb+

n-Hexane 2-Methylpentane 3-Methylpentane 2,2-Dimethylbutane 2,3-Dimethylbutane 2-Bromopropane 1-Bromopropane

+ Hz and C3H7+ +CzH3+ + CH4 m2*

KE of ml*, eV

torr5-[ml*]f [C3H,+l

5A[ml*lbJ [C&L+I

0.20 0.20 0.21 0.21 0.20 0.21 0.20

1.60 1.18 1.10 0.59 1.09 1.61 1.71

0.98 0.91 c

0.99 d c c

X

tow[ma*]f [CJb+l 0.67 0.67 0.64 0.68 0.64 0.67

-

A[mt*]*J [GH,+l

1.46 1.36

1.88 2.04 1.91 1.85 d 1.85 2.32e

~

1.44

c

___-

A[ml*] [ma*]

1

x

-

torra [ma*]' Atmi*] __ [GH,+I [ma*] 1.24 1.33 1,29 1.24 1.25 1.27 1.50"

a Approximate pressure in drift region. b Abundance in excess of that at