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. Author manuscript; available in PMC: 2013 Nov 5.
Published in final edited form as: Mol Pharm. 2012 Oct 3;9(11):3266–3276. doi: 10.1021/mp300326z

Table 2.

Calculated Proton Affinities and Measured Intrinsic Second Order Rate Constants for mPEG-VE-DOG Lipids with Varying Electronic Properties

mPEG-
VE-Lipid
Proton
Affinity
(kcal/mol)
Second Order
Rate Constant (M−1 sec−1)
ST912 −240.26 5.2 × 104
ST502 −237.32 730
ST505 240
ST302 −215.88 1.4 × 10−2
ST305 8.3 × 10−3
ST152 −207.51 5 × 10−6
ST155 2.5 × 10−5