aliphatic including unsaturated aliphatic partially saturated aliphatic or saturated aliphatic and they may be carbocyclic or heterocyclic among heterocyclic g groups some suitable heteroatoms are for example nitrogen sulfur oxygen and combinations thereof ring systems suitable as chemical group g may be monocyclic bicyclic tricyclic polycyclic spiro or fused among suitable chemical group g ring systems that are bicyclic tricyclic or fused the various rings in a single chemical group g may be all the same type or may be of two or more types for example an aromatic ring may be fused with an aliphatic ring in some embodiments g is a ring system that contains a saturated or unsaturated 3 membered ring such as for example a substituted or unsubstituted cyclopropane cyclopropene epoxide or aziridine ring in some embodiments g is a ring system that contains a 4 membered heterocyclic ring in some of such embodiments the heterocyclic ring contains exactly one heteroatom independently in some embodiments g is a ring system that contains a heterocyclic ring with 5 or more members in some of such embodiments the heterocyclic ring contains 1 to 4 heteroatoms independently in some embodiments the ring in g is unsubstituted in other embodiments the ring system contains 1 to 5 substituents in some of the embodiments in which g contains substituents each substituent is independently chosen from the substituents described herein above also suitable are embodiments in which g is a carbocyclic ring system in some embodiments each g is independently a substituted or unsubstituted phenyl pyridyl cyclohexyl cyclopentyl cycloheptyl pyrolyl furyl thiophenyl triazolyl pyrazolyl 1 3 dioxolanyl or morpholinyl among these embodiments include those embodiments for example in which g is unsubstituted or substituted phenyl cyclopentyl cycloheptyl or cyclohexyl in some of these embodiments g.