A racemic or optically enriched compound of Formula 1:

##STR00001## wherein P is H or a protective group for hydroxyl groups; and X is Cl, Br, I, or CH.sub.2CH.sub.2CH.sub.2COOR.sub.1, wherein R.sub.1 is C.sub.1-7-alkyl or C.sub.7-11-aralkyl.

The present invention relates to the field of organic synthesis and more specifically it concerns a process for the dehydrogenation of compound of formula (I) catalyzed by palladium (Pd.sup.0) in elemental metallic form.

The present invention relates to the field of organic synthesis and more specifically it concerns a process for the dehydrogenation of compound of formula (I) catalyzed by palladium (Pd.sup.0) in elemental metallic form.

The present invention relates to the field of organic synthesis and more specifically it concerns a process for the dehydrogenation of compound of formula (I) catalyzed by palladium (Pd.sup.0) in elemental metallic form.

A method for cycloaddition of dimethyl muconate is disclosed. According to the method, a direct transferring of a solid phase trans,trans-dimehtyl muconate into a reactor pre-filled with ethylene gas increases the efficiency of the reaction and suppress side reactions resulting an improvements in yield and purity. Furthermore, the method is capable of obtaining a high yield of dimethylcyclohex-2-en-1,4-dicarboxylate at a lower cost, and therefore is also useful for the mass synthesis of dimethyl terephthalate.

A method for cycloaddition of dimethyl muconate is disclosed. According to the method, a direct transferring of a solid phase trans,trans-dimehtyl muconate into a reactor pre-filled with ethylene gas increases the efficiency of the reaction and suppress side reactions resulting an improvements in yield and purity. Furthermore, the method is capable of obtaining a high yield of dimethylcyclohex-2-en-1,4-dicarboxylate at a lower cost, and therefore is also useful for the mass synthesis of dimethyl terephthalate.

Methods of synthesizing compounds comprising fluorinated aryl groups are disclosed, wherein said methods utilize hydrogen bond directed photocatalytic hydrodefluorination.

Methods of synthesizing compounds comprising fluorinated aryl groups are disclosed, wherein said methods utilize hydrogen bond directed photocatalytic hydrodefluorination.

Provided is a method for preparing an N-cyclopropylmethyl aniline compound, which comprises reacting a compound represented by Formula IV with cyclopropyl formaldehyde in the presence of metal zinc and an acid to generate an N-cyclopropylmethyl aniline compound represented by Formula I. The method of the present disclosure has mild reaction conditions, short reaction time, a high yield, simple processes, simple operations and low costs, and is more applicable to industrial production.

Provided is a method for preparing an N-cyclopropylmethyl aniline compound, which comprises reacting a compound represented by Formula IV with cyclopropyl formaldehyde in the presence of metal zinc and an acid to generate an N-cyclopropylmethyl aniline compound represented by Formula I. The method of the present disclosure has mild reaction conditions, short reaction time, a high yield, simple processes, simple operations and low costs, and is more applicable to industrial production.