David Y Tang

US Patent:

44709307, Sep 11, 1984

Filed:

Feb 9, 1982

Appl. No.:

6/347390

Inventors:

David Y. Tang - Amherst NY
Byron R. Cotter - Grand Island NY
Frederick J. Goetz - Santa Ana CA

Assignee:

Occidental Chemical Corporation - Niagara Falls NY

International Classification:

C07C12152
C07C119048
C07C 2513

US Classification:

260465G

Abstract:

Chloro-aromatic compounds of the formula ##STR1## wherein R is CF. sub. 3, OCF. sub. 3, OC. sub. 2 F. sub. 5, CN, NCO, or COCl, m is 0 or 1, and n is 0 or 1 are prepared by the vapor phase chloro-denitration reaction of a chlorinating agent with a nitro-aromatic compound of the formula ##STR2## where R, m, and n are as defined above.

US Patent:

42129982, Jul 15, 1980

Filed:

May 14, 1979

Appl. No.:

6/038762

Inventors:

David Y. Tang - Eggertsville NY
Arthur M. Foster - Snyder NY

Assignee:

Hooker Chemicals & Plastics Corp. - Niagara Falls NY

International Classification:

C07C 3114

US Classification:

568807

Abstract:

The present invention relates to a novel organic compound, 1-phenyl-3-(3-trifluoromethylphenyl)-2-propanol. This compound may be produced by: a. condensing 3-trifluoromethylbenzaldehyde with acetophenone under basic conditions to form a substituted chalcone, b. epoxidation of the substituted chalcone to produce the corresponding epoxide, c. converting the epoxide to a chlorohydrin, and d. catalytic hydrogenolysis of the chlorohydrin to produce a diol and subsequently converting the diol into the corresponding alcohol, 1-phenyl-3-(3-trifluoromethylphenyl)-2-propanol.

US Patent:

42713196, Jun 2, 1981

Filed:

May 14, 1979

Appl. No.:

6/038764

Inventors:

David Y. Tang - Eggertsville NY
Arthur M. Foster - Snyder NY

Assignee:

Hooker Chemicals & Plastics Corp. - Niagara Falls NY

International Classification:

C07C 4558
C07C 49245

US Classification:

568312

Abstract:

The present invention relates to a novel organic compound, phenyl beta-chloro-alpha-hydroxy-beta-(3-trifluoromethylphenyl)ethyl ketone. This compound may be produced by: (a) condensing 3-trifluoromethylbenzaldehyde with acetophenone under basic conditions to form a substituted chalcone, (b) epoxidation of the substituted chalcone to produce the corresponding epoxide, and (c) converting the epoxide to a chlorohydrin, phenyl beta-chloro-alpha-hydroxy-beta-(3-trifluoromethylphenyl)ethyl ketone.

US Patent:

48017639, Jan 31, 1989

Filed:

Jul 27, 1987

Appl. No.:

7/078327

Inventors:

James J. Maul - Grand Island NY
Bobby F. Dannels - Grand Island NY
David Y. Tang - East Amherst NY

Assignee:

Occidental Chemical Corporation - Niagara Falls NY

International Classification:

C07C 1720
C07C 1738
C07C 1908
C07G 1300

US Classification:

570177

Abstract:

A process is disclosed for purifying and stabilizing a mixture of regular chlorotrifluoroethyelne telomers of formula RCXCl(CF. sub. 2 CFCl). sub. n Br from bromine-containing irregular telomer impurities of similar molecular weight. The telomer mixture is produced by reacting chlorotrifluoroethylene with a telogen of formula RCXClBr, where R is CF. sub. 2 Br, or Cl, and X is Cl or F. The telomer mixture is then chlorinated using either elevated temperature alone (100. degree. C. -350. degree. C. ), or a combination of elevated temperatures (100. degree. C. -200. degree. C. ) and light energy primarily of the wavelength region greater than about 3000. degree. A. Under these conditions, CFClBr telomer end group of the regular or normal telomer is chlorinated to form --CFCl. sub. 2 end groups, while the bromine-containing irregular telomer impurities (whose bromine-containing end groups are substantially only --CF. sub. 2 Br) are substantially not chlorinated.

US Patent:

49688308, Nov 6, 1990

Filed:

Sep 11, 1989

Appl. No.:

7/405607

Inventors:

David Y. Tang - East Amherst NY

Assignee:

Occidental Chemical Corporation - Niagara Falls NY

International Classification:

C07B 3504

US Classification:

558425

Abstract:

Halogen substituted aromatic compounds of the formula ##STR1## wherein Y is selected from the group CO. sub. 2 H, COF, COCl, COBr, CF. sub. 3, CN, NCO, or F, and X and X' are independently hydrogen or a halogen selected from the group F-, Cl- and Br-, at least one of X and X' being halogen; may be prepared by the liquid phase reaction of a brominating agent, at temperatures below about 190. degree. Celsius, with a correspondingly substituted cyclohexene or cyclohexadiene.

US Patent:

46032223, Jul 29, 1986

Filed:

Aug 30, 1984

Appl. No.:

6/645723

Inventors:

David Y. Tang - Amherst NY
Byron R. Cotter - Northvale NJ
Frederick J. Goetz - Wilmington DE

Assignee:

Occidental Chemical Corporation - Niagara Falls NY

International Classification:

C07C 4116
C07C 4564

US Classification:

568315

Abstract:

Diphenyl ethers of the formula ##STR1## wherein m is 1-3, n is 1 or 2, R is hydrogen, carboxy, carboxylate salt or ester, formyl oxime, cyano, alkyl, alkoxy, chloro, bromo, or N, N-dialkyl amino, are prepared by reacting a chloro-fluoro-benzotrifluoride of the formula ##STR2## wherein m and n are as defined above with a nitro-phenoxide of the formula ##STR3## where R is defined above, and M is a cation of an alkali metal or an alkaline earth metal.

US Patent:

51771810, Jan 5, 1993

Filed:

Jun 6, 1991

Appl. No.:

7/710872

Inventors:

Jerold Rosenfeld - Tonawanda NY
David Y. Tang - Amherst NY
John Tyrell - Williamsville NY

Assignee:

Occidental Chemical Corporation - Niagara Falls NY

International Classification:

C08G 6926

US Classification:

528353

Abstract:

Disclosed is an aromatic diamine having the general formula ##STR1## where A is a group containing at least one aromatic ring, each Y is independently selected from ##STR2## R is a group containing at least one olefinically unsaturated group, R' is hydrogen, alkyl to C. sub. 25, aryl, or R, n is 1 to 4, and the number of olefinic groups in Y is at least 3 when each Y is ##STR3## and otherwise is at least 2. Photosensitive polyamic acids and polyimides can be prepared from the aromatic diamines which can be crosslinked with light to a mask to form patterns on a substrate.

US Patent:

50496824, Sep 17, 1991

Filed:

Sep 11, 1989

Appl. No.:

7/405606

Inventors:

David Y. Tang - Amherst NY
Mary K. Cocoman - Grand Island NY
Harry E. Buckholtz - Lewiston NY

Assignee:

Occidental Chemical Corporation - Dallas TX

International Classification:

C07D30774

US Classification:

549246

Abstract:

Halophthalic anhydrides are prepared by the liquid phase reaction of a brominating agent with halogen substituted hexa- or tetra-hydrophthalic anhydrides.