Catalyst component for the polymerization of olefins comprising Mg, Ti and an electron donor of formula (I) ##STR00001## In which X and Y are selected from, R.sup.1, and OR.sup.1 and NR.sub.2, B is oxygen or sulphur S is sulphur, R.sup.1 is selected from C.sub.1-C.sub.15 hydrocarbon groups, optionally contain a heteroatom selected from halogen, P, S, N, O and Si, which can be fused together to form one or more cycles, R is hydrogen or R.sup.1 and A is a bivalent bridging group with chain length between the two bridging bonds being 1-10 atoms.

Catalyst component for the polymerization of olefins comprising Mg, Ti and an electron donor of formula (I) ##STR00001## In which X and Y are selected from, R.sup.1, and OR.sup.1 and NR.sub.2, B is oxygen or sulphur S is sulphur, R.sup.1 is selected from C.sub.1-C.sub.15 hydrocarbon groups, optionally contain a heteroatom selected from halogen, P, S, N, O and Si, which can be fused together to form one or more cycles, R is hydrogen or R.sup.1 and A is a bivalent bridging group with chain length between the two bridging bonds being 1-10 atoms.

Novel substituted N-acetyl-L-cysteine (NAC) derivatives and related compounds and methods of using these compounds for the treatment of diseases and/or conditions, including but not limited to diseases and/or conditions of, or involving, the Central Nervous System (CNS), including schizophrenia adrenoleukodystrophy, mitochondrial diseases (e.g. Leigh syndrome, Alpers' disease, and MELAS), Huntington's disease, trichotillomania, HIV-associated neurocognitive disorder, hypoxic-ischemic encephalopathy, drug craving, and drug addiction.

A method for synthesizing of thioesters by using a compound as a catalyst is disclosed. The compound is represented by formula I below: ##STR00001##
In formula I, R.sup.5 represents H, a substituted or unsubstituted alkyl, a substituted or unsubstituted aryl, or a substituted or unsubstituted heteroaryl; X and Y each independently represents one of H, C.sub.1-10 alkyl, C.sub.5-10 aryl, C.sub.1-10 alkyl alcohol, thiohydroxy, carbonyl, sulfonyl, sulfamoyl, carbamoyl, C.sub.1-10 alkoxycarbonyl, C.sub.1-10 alkoxycarbamoyl, C.sub.1-10 alkylamino, C.sub.1-10 alkylsulfonyl, C.sub.1-10 haloalkylsulfonyl, ureido, amido, and C.sub.1-10 alkoxylcarbamoyl; and n is 0, 1, 2, 3, 4 or 5.

A method for synthesizing of thioesters by using a compound as a catalyst is disclosed. The compound is represented by formula I below: ##STR00001##
In formula I, R.sup.5 represents H, a substituted or unsubstituted alkyl, a substituted or unsubstituted aryl, or a substituted or unsubstituted heteroaryl; X and Y each independently represents one of H, C.sub.1-10 alkyl, C.sub.5-10 aryl, C.sub.1-10 alkyl alcohol, thiohydroxy, carbonyl, sulfonyl, sulfamoyl, carbamoyl, C.sub.1-10 alkoxycarbonyl, C.sub.1-10 alkoxycarbamoyl, C.sub.1-10 alkylamino, C.sub.1-10 alkylsulfonyl, C.sub.1-10 haloalkylsulfonyl, ureido, amido, and C.sub.1-10 alkoxylcarbamoyl; and n is 0, 1, 2, 3, 4 or 5.