| Patent Number |
Title Of Patent |
Date Issued |
| 7067703 |
Manufacture of retinoids |
June 27, 2006 |
| A process for the manufacture of retinal (I) comprises reacting a 5-(2,6,6-trimethyl-cyclohex-1-enyl)-1,4-pentadiene derivative (IIa) or a 5-(2,6,6-trimethyl-cyclohex-2-enyl)-1,4-pentadiene derivative (IIb) or a 5-(2,6,6-trimethyl-2-cyclohexen-1-ylidene)-1-pentene derivative (IIc) or |
| 6348606 |
Cyclic dienol ethers |
February 19, 2002 |
| The claimed invention relates to cyclic dienol ethers of formula (III). ##STR1##wherein R.sup.3 is hydrogen and R.sup.4 is C.sub.1-4 alkoxy or R.sup.3 and R.sup.4 together form an optionally substituted methylenedioxy group --O--C(R.sup.5)(R.sup.6)--O--, wherein R.sup.5 and R.sup.6 are e |
| 6201155 |
Process for making 4,4'-diketo-carotenoids |
March 13, 2001 |
| A process for the manufacture of a symmetrical, terminally ring-substituted polyenes by reacting a polyene di(O,O-dialkyl acetal) with a cyclic dienol ether in the presence of a Lewis or Bronsted acid, hydrolyzing the condensation product resulting therefrom and cleaving off alcohol unde |
| 6153769 |
Manufacture of polyene aldehydes |
November 28, 2000 |
| A process for the manufacture of polyene aldehydes comprises reacting a polyene O,O-ethylene acetal with a 1-alkoxy-1,3-diene in the presence of a Lewis acid or Bronsted acid, hydrolyzing the resulting condensation product and cleaving off alcohol under basic or acidic conditions from th |
| 6018075 |
Process for the manufacture of a .gamma. -acetoxy-tiglic aldehyde |
January 25, 2000 |
| A process for the manufacture of a .gamma.-acetoxy-tiglic aldehyde by reacting a .gamma.-bromotiglic aldehyde or a .gamma.-chlorotiglic aldehyde with sodium acetate or potassium acetate in an organic solvent in the presence of a phase transfer catalyst. |
| 5986113 |
Process for manufacturing polyene esters and acids |
November 16, 1999 |
| A process for the manufacture of polyene esters or polyene acids comprises reacting a polyene O,O-dialkylacetal of di(O,O-dialkylacetal) with a vinylketene acetal or analogue thereof in the presence of a Lewis acid, hydrolyzing the reaction mixture depending on the vinylketene acetal use |
| 5929288 |
Process for manufacturing polyene aldehydes |
July 27, 1999 |
| To manufacture polyene aldehydes and polyene dialdehydes a polyene O,O-dialkyl acetal or polyene di(O,O-dialkyl acetal) is reacted with a 1-alkoxy-1,3-diene in the presence of a Lewis acid or a Bronsted acid. The reaction mixture is then hydrolyzed and the alcohol is cleaved under basic |
| 5786518 |
Process for the manufacture of a gamma-halotiglic aldehyde |
July 28, 1998 |
| A novel process for the manufacture of a .gamma.-halotiglic aldehyde HalH.sub.2 C--CH.dbd.C(CH.sub.3)--CHO [I], wherein Hal signifies chlorine or bromine, comprises haloalkoxylating a 1-alkoxy-2-methyl-1,3-butadiene H.sub.2 C.dbd.CH--C(CH.sub.3).dbd.CH--OR.sup.1 [II], wherein R.sup.1 |
| 5777149 |
Method for the production of (3-alkoxycarbonyl-2-butenyl) triphenylphosphonium salts |
July 7, 1998 |
| Novel processes and intermediates useful for the manufacture of the Wittig ester salts are disclosed. The Wittig ester salts are known as important C.sub.5 building blocks for the manufacture of various polyenecarboxylic acid esters in the field of carotenoid chemistry. |
| 5763651 |
Process for manufacturing polyene esters and acids |
June 9, 1998 |
| A process for the manufacture of polyene esters or polyene acids comprises reacting a polyene O,O-dialkylacetal of di(O,O-dialkylacetal) with a vinylketene acetal or analogue thereof in the presence of a Lewis acid, hydrolyzing the reaction mixture depending on the vinylketene acetal use |
| 5681977 |
Method for the production of (3-alkoxycarbonyl-2-butenyl) triphenylphosphonium salts |
October 28, 1997 |
| Novel processes and intermediates useful for the manufacture of the Wittig ester salts are disclosed. The Wittig ester salts are known as important C.sub.5 building blocks for the manufacture of various polyenecarboxylic acid esters in the field of carotenoid chemistry. |
| 5631398 |
Method for the production of (3-alkoxycarbonyl-2-butenyl) triphenylphosphonium salts |
May 20, 1997 |
| A processes and intermediates useful for the manufacture of the Wittig ester salts are disclosed. The Wittig ester salts are known as important C.sub.5 building blocks for the manufacture of various polyenecarboxylic acid esters in the field of carotenoid chemistry. |
| 5502236 |
Method for the production of (3-alkoxycarbonyl-2-butenyl)triphenylphosphonium salts |
March 26, 1996 |
| Novel processes and intermediates useful for the manufacture of the Wittig ester salts are disclosed. The Wittig ester salts are known as important CS building blocks for the manufacture of various polyenecarboxylic acid esters in the field of carotenoid chemistry. |
| 4853156 |
Process for the manufacture of quinone derivatives |
August 1, 1989 |
| A novel process for the manufacture of quinone derivatives is described.In this process a compound of the formula ##STR1## is reacted with a compound of the formula ##STR2## and the resulting compound of the formula ##STR3## is subjected to a retro-Diels-Alder reaction. The s |
| 4663470 |
Alpha-tocopherol intermediates |
May 5, 1987 |
| A novel process for the manufacture of quinone derivatives which are suitable as intermediates for the manufacture of (2RS,4'R,8'R)-tocopherol is described. In this process a quinone of the formula ##STR1## is reacted with a phytyl derivative of the formula ##STR2## If desire |
| 4642361 |
Alpha-tocopherol intermediates |
February 10, 1987 |
| A novel process for the manufacture of quinone derivatives which are suitable as intermediates for the manufacture of (2RS,4'R,8'R)-tocopherol is described. In this process a quinone of the formula ##STR1## is reacted with a phytyl derivative of the formula ##STR2## If desire |
| 4603223 |
Process for the manufacture of quinone derivatives |
July 29, 1986 |
| A novel process for the manufacture of quinone derivatives is described.In this process a compound of the formula ##STR1## is reacted with a compound of the formula ##STR2## and the resulting compound of the formula ##STR3## is subjected to a retro-Diels-Alder reaction. The s |
