A compound represented by the General Formula (I) as defined herein, in which, in the General Formula (I), P.sup.1 and P.sup.2 each independently represent a hydrogen atom, CN, NCS, or a polymerizable group, Sp.sup.1 and Sp.sup.2 each independently represent a single bond or a divalent linking group as defined herein, Z.sup.1, Z.sup.2 and Z.sup.3 each independently represent a particular linking group as defined herein, X.sup.1 and X.sup.2 each independently represent a single bond or S as defined herein, k represents an integer of 2 to 4, m and n each independently represent an integer of 0 to 3 as defined herein, A.sup.1, A.sup.2, A.sup.3, and A.sup.4 each independently represent a particular group as defined herein is provided.

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.

According to the present invention, there is provided a method for producing carboxylic acid thioester, comprising reacting a compound represented by the following formula (I), carboxylic acid and thiol in the presence of a catalyst including at least one Group 2 metal compound. The production method is a production method which is simple in reaction operation, which places a small load on the environment and the human body and which enables carboxylic acid thioester to be catalytically obtained at a high yield even at a normal temperature and a normal pressure (25 C., 1 atm). In the formula (I), R.sup.1 and R.sup.2 each independently represent a hydrocarbon group having 1 to 20 carbon atoms.

##STR00001##

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.

The present invention relates to synthetic organic antioxidants of small molecules. The novel dithiol-containing compounds in this invention possess strongest possible capability as both scavenger for free radicals and antioxidant. This invention is directed to novel molecules as prodrugs of the novel dithiol-containing compounds, their rational design, their feasible preparation route by means of synthetic organic chemistry, and their potential uses in application to treatment and/or prevention of major diseases associated with oxidative stress, such as Alzheimer's disease, Parkinson's disease, cancer, diabetes, HIV, acne, cardiovascular disease, renal disease, hypertension, hypercholesterolemia, hyperlipidemia, rheumatoid arthritis, inflammation, pain, aging, stroke, cataract, glaucoma, age-related macular degeneration, etc.

The present invention relates to synthetic organic antioxidants of small molecules. The novel dithiol-containing compounds in this invention possess strongest possible capability as both scavenger for free radicals and antioxidant. This invention is directed to novel molecules as prodrugs of the novel dithiol-containing compounds, their rational design, their feasible preparation route by means of synthetic organic chemistry, and their potential uses in application to treatment and/or prevention of major diseases associated with oxidative stress, such as Alzheimer's disease, Parkinson's disease, cancer, diabetes, HIV, acne, cardiovascular disease, renal disease, hypertension, hypercholesterolemia, hyperlipidemia, rheumatoid arthritis, inflammation, pain, aging, stroke, cataract, glaucoma, age-related macular degeneration, etc.

Provided are a naphthalenedithiol or a derivative thereof that can achieve both high refractive index and high dissolubility (compatibility), and a process for producing the same and a use therefor. A naphthalene compound of the present invention is represented by the formula (1):

##STR00001## wherein R.sup.1 and R.sup.2 independently represent a hydrogen atom or a substituent, R.sup.3 represents a substituent, and n denotes an integer of 0 to 6.

At least one of R.sup.1 and R.sup.2 may represent the substituent. The naphthalene compound of the formula (1) may be dissolved in or mixed with an organic solvent to prepare a mixture (or blend); a curable composition containing the naphthalene compound of the formula (1) may be prepared; a resin of the present invention at least contains a constituent unit represented by the formula (1P):

##STR00002## wherein R.sup.3 represents a substituent, and n denotes an integer of 0 to 6.

Provided are a naphthalenedithiol or a derivative thereof that can achieve both high refractive index and high dissolubility (compatibility), and a process for producing the same and a use therefor. A naphthalene compound of the present invention is represented by the formula (1):

##STR00001## wherein R.sup.1 and R.sup.2 independently represent a hydrogen atom or a substituent, R.sup.3 represents a substituent, and n denotes an integer of 0 to 6.

At least one of R.sup.1 and R.sup.2 may represent the substituent. The naphthalene compound of the formula (1) may be dissolved in or mixed with an organic solvent to prepare a mixture (or blend); a curable composition containing the naphthalene compound of the formula (1) may be prepared; a resin of the present invention at least contains a constituent unit represented by the formula (1P):

##STR00002## wherein R.sup.3 represents a substituent, and n denotes an integer of 0 to 6.

Provided is an active light sensitive or radiation sensitive resin composition which contains a compound (A) represented by General Formula (I) or (II): ##STR00001##
in the formulae, each of Y.sub.1 and Y.sub.2 represents a monovalent organic group; each of M.sub.1.sup.+ and M.sub.2.sup.+ represents an organic onium ion; each of X.sub.1 and X.sub.2 represents a group that is represented by S, NH, or NR.sup.1; R.sup.1 represents a monovalent organic group; each of n1 and n2 represents an integer of 1 or more; and R.sup.1 and Y.sub.1 or Y.sub.2 may bond with each other to form a ring.