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Abbreviations 903
(R) rectus, designation of chirality center
Re face a face of a planar, sp
2
-hybridized carbon atom
RNA ribonucleic acid
ROMP ring-opening metathesis polymerization
(S) sinister, designation of chirality center
sec- secondary
Si face a face of a planar, sp
2
-hybridized carbon atom
SN1 unimolecular substitution reaction
SN2 bimolecular substitution reaction
tert- tertiary
THF tetrahydrofuran
TMS tetramethylsilane nmr standard, (CH3)4Si 
CH3S
O
O
Tos tosylate group,
UV ultraviolet
X– halogen group (–F, –Cl, –Br, –I)
(Z) zusammen, stereochemical designation of double bond geometry
chemical reaction in direction indicated
reversible chemical reaction
resonance symbol
 
curved arrow indicating direction of electron flow
≡ is equivalent to
> greater than