Abstract: This invention relates to a hypertension treating agent comprising an ester of a polyprenyl alcohol of the general formula: ##STR1## wherein n represents an integer of 7-10 and R' is a saturated or unsaturated aliphatic hydrocarbon group of 1-17 carbon atoms; cyclohexyl group; unsubstituted phenyl group or phenyl group substituted with a halogen atom or a lower alkoxy group; (halogen atom-substituted phenoxy)-lower alkyl group; or pyridyl group.

Abstract: This invention relates to a hypertension treating agent comprising a polyprenyl alcohol or an ester thereof of the general formula: ##STR1## wherein n represents an integer of 7-10 and A represents a group of the general formula: ##STR2## in which a and b each represent hydrogen or they may form a bond, or ##STR3## in which R represents hydrogen or --COR', R' being a saturated or unsaturated aliphatic hydrocarbon group of 1-17 carbon atoms; cyclohexyl group; unsubstituted phenyl group or phenyl group substituted with a halogen atom or a lower alkoxy group; (halogen atom-substituted phenoxy)-lower alkyl group; or pyridyl group.

Abstract: A therapeutic preparation having excellent effect for peptic ulcers with low toxicity which comprises aliphatic ketone derivative of the general formula: ##STR1## wherein represents a saturated or unsaturated bond, R.sub.1 is hydrogen or a lower alkyl group, R.sub.2 is hydrogen atom, a lower alkyl group or a lower alkylcarbonyl group, R.sub.3 is an aliphatic hydrocarbon group of the general formula: ##STR2## WHEREIN L, M AND N ARE 0 OR 1, PROVIDED THAT L+M+N.gtoreq.2; AND A, B, C, D, E AND F ARE HYDROGEN ATOM, OR THEY MAY FORM A BOND OF A--B, C--D OR E--F, PROVIDED THAT IF THE BOND IS A SATURATED BOND, THE A, B, C, D, E AND F REPRESENT ALL HYDROGEN ATOM.

Abstract: A process for synthesizing 2,3-dimethoxy-5-methyl-6-substituted-1,4-benzoquinones having the formula: ##STR1## wherein R is ##STR2## in which n is an integer of 0 to 9, and A and B are hydrogens or taken together form a valence bond,In which 2-methyl-4,5,6-trimethoxyphenol is reacted with boric acid or a reactive derivative thereof to obtain a 2-methyl-4,5,6-trimethoxyphenol ester of boric acid, reacting the resulting ester with an n-prenol or iso-prenol having the formula: ##STR3## wherein R is as defined above, OR A REACTIVE DERIVATIVE OF SAID N- OR ISO-PRENOL, IN THE PRESENCE OF A SILICA-ALUMINA COMPOUND, TO OBTAIN A 2-METHYL-3-SUBSTITUTED-4,5,6-TRIMETHOXYPHENOL ESTER OF BORIC ACID, AND HYDROLYZING THE THUS-OBTAINED ESTER AND TREATING THE RESULTING 2-METHYL-3-SUBSTITUTED 4,5,6-TRIMETHOXYPHENOL HAVING THE FORMULA: ##STR4## wherein R is as defined above, with an oxidant.

Abstract: A process for the synthesis of 2,3-dimethoxy-5-methyl-6-substituted-1,4-benzoquinones having the formula: ##STR1## wherein R is ##STR2## in which n is an integer of 0 to 9, and A and B are hydrogens or A--B is a direct valence bond between the carbon atoms to which they are attached,Characterized by reacting 2-methyl-4,5,6-trimethoxyphenol with an aryl boronic acid, a lower alkyl boronic acid or an acid anhydride thereof to obtain a 2-methyl-4,5,6-trimethoxyphenol ester of boric acid, reacting the resulting ester with an n-prenol or iso-prenol having the formula: ##STR3## wherein R is as defined above, OR A REACTIVE DERIVATIVE OF SAID N- OR ISO-PRENOL, IN THE PRESENCE OF A SILICA-ALUMINA COMPOUND, TO OBTAIN A 2-METHYL-3-SUBSTITUTED-4,5,6-TRIMETHOXYPHENOL ESTER OF BORIC ACID, AND HYDROLYZING THE THUS-OBTAINED ESTER AND TREATING THE RESULTING 2-METHYL-3-SUBSTITUTED-4,5,6-TRIMETHOXYPHENOL HAVING THE FORMULA: ##STR4## wherein R is as defined above, WITH AN OXIDIZING AGENT.

Abstract: 2,3-DIMETHOXY-5-METHYL-6-SUBSTITUTED-1,4-BENZOQUINONE HAVING THE FORMULA: ##STR1## in which S is an integer of 0 to 11 and A and B stand for hydrogen or may form a direct bond,Is prepared by reacting boric acid ester of 2,3-dimethoxy-5-methyl-1,4-benzohydroquinone with prenol or isoprenol having the above group R and subsequently reacting the resulting borate with a mild oxidant. The compound is useful as coenzyme Q and has various clinical effects.

Abstract: 2,3-DIMETHOXY-5-SUBSTITUTED-6-METHYL-1,4-BENZOHYDROQUINONE OR 1-MONOESTER THEREOF IS PREPARED BY REACTING 2,3-DIMETHOXY-6-METHYL-1,4-BENZOHYDROQUINONE OR 1-MONOACYLESTER THEREOF WITH PRENOL, ISOPRENOL OR DERIVATIVES THEREOF IN THE PRESENCE OF AN ACIDIC CATALYST FOR CONDENSATION WHICH IS ADSORBED ON AN ADSORBENT. This obtained compound is easily converted to quinone compounds which produces many clinical effects in medical and pharmaceutical uses.

Abstract: 2,3-DIMETHOXY-5-METHYL-6-SUBSTITUTED-1,4-BENZOQUINONE HAVING THE FORMULA: ##STR1## in which R is ##STR2## in which S is an integer of 0 to 11 and A and B stand for hydrogen or may form a direct bond, is prepared by reacting a boric acid ester of 2,3-dimethoxy-5-methyl-1,4-benzohydroquinone with prenol or isoprenol having the above group R and subsequently reacting the resulting borate with a mild oxidant. The compound is useful as coenzyme Q and has various clinical effects.