E.i. Dupont De Nemours and Company

Hewlett-packard Company

Other

John B Adams, Jr

Joseph J Kirkland

Joel Benjamin Wommack, Jr

Richard F Sauers

Kang Lin

Dennis R Rayner

Detlef Geffken

Richard Lee Ellis

The present invention provides propylene-bridged bidentate silane reagents for modifying the surface of liquid chromatography supports, these supports and methods of making and using the same. When bonded to the surface of a support material, the resulting modified support material provides improved properties, such as better separations and more stable support materials, especially when used in liquid chromatography. These bidentate silanes have the general structure: RSiMe(NMe.sub.2)--(CH.sub.2).sub.3 --SiMeR--NMe.sub.2. R is an n-octadecyl group or an n-tetradecyl group, and Me is a methyl group. When reacted with a silica surface, the resulting modified surface has a structure: PSiO--[RSiMe--(CH.sub.2).sub.3 --SiMeR]--OSiP. PSiO is surface-reacted silica.

Propylene-bridged bidentate silanes

The present invention provides propylene-bridged bidentate silane reagents for modifying the surface of liquid chromatography supports, these supports and methods of making and using the same. When bonded to the surface of a support material, the resulting modified support material provides improved properties, such as better separations and more stable support materials, especially when used in liquid chromatography. These bidentate silanes have the general structure: RSiMe(NMe.sub.2)--(CH.sub.2).sub.3 --SiMeR--NMe.sub.2. R is an n-octadecyl group or an n-tetradecyl group, and Me is a methyl group. When reacted with a silica surface, the resulting modified surface has a structure: PSiO--�RSiMe--(CH.sub.2).sub.3 --SiMeR!--OSiP. PSiO is surface-reacted silica.

The present invention provides asymmetric bidentate silane reagents from modifying the surface of liquid chromatography supports, the supports and methods of making and using the same. When bonded to the surface of a support material, the resulting modified support material provides improved properties, such as better separations and more stable support materials, especially when used in liquid chromatography. These bidentate silanes have the general structure: R.sub.1 SiMe(NMe.sub.2)--(CH.sub.2).sub.n --SiMeR.sub.2 (NMe.sub.2). R.sub.1 is an alkyl group having from 1 to 30 carbon atoms, and R.sub.2 is an alkyl group having from 8 to 18 carbon atoms. R.sub.1 is a different alkyl group than R.sub.2. Me is a methyl group, and n has a value 2 or 3. In certain embodiments, R.sub.2 includes at least one functional group. When reacted with a silica surface, the resulting modified surface has a structure: PSiO--�R.sub.1 SiMe--(CH.sub.2).sub.n --SiMeR!--OSiP. PSiO is a surface reacted silica.

Asymmetric bidentate silanes

Fungicidal oxazolidinones

Pyridyl sulfones, e.g., N-[(4,6-dimethylpyrimidin-2-yl)aminocarbonyl]-2-(methylsulfonyl)-3-pyridin esulfonamide, are useful for the regulation of plant growth and as pre-emergence and post-emergence herbicides.

Pyridyl sulfone herbicides

Compounds of the class of phenoxy esters of N-[(heterocyclic)aminocarbonyl]sulfamic acid, such as N-[(4,6-dimethoxypyrimidin-2-yl)aminocarbonyl]sulfamic acid. 2-(trifluoromethylthio)phenyl ester, useful as pre-emergent or post-emergent herbicides.

Herbicidal phenoxy esters of N-(heterocyclic)aminocarbonyl)sulfamic acid

This invention pertains to benzenesulfonamides and their use as agricultural chemicals.

Herbicidal sulfonamides

This invention relates to ortho(acyloxy)benzenesulfonamides and their use as herbicides.

2-(Methoxycarbonylamino)-1H-benzimidazole-1-carboxylic acid esters such as with 1-(4-chlorophenoxy)-3,3-dimethyl-1-(1H-1,2,4-triazol-1-yl)-2-butanol are effective in controlling plant fungus diseases.

Fungicidal carbamates of triazole ethanols (or ethenols)

A stable aqueous composition of maneb which includes a soluble zinc salt and formaldehyde.

Aqueous fungicidal formulations and their preparation

2,3-Dihalo-6-quinoxalinesulfonyl fluoride compounds are useful as fungicides and insecticides.

2,3-Dihalo-6-quinoxalinesulfonyl fluorides

The substituted butanoic acid esters 2-(4-azidophenyl)-3-methylbutanoic acid, .alpha.-cyano-3-phenoxybenzyl ester and 2-(4-azidophenyl)-3-methylbutanoic acid, 3-phenoxybenzyl ester are useful as insecticides.

Substituted butanoic acid esters

A primary storage or support unit adapted to rest on a floor or be supported above the floor. The unit pivotally mounts a flat work panel which can be moved into a horizontal orientation where it serves as a desk or table or moved into a vertical orientation where it serves as part of a display and/or a cover for the storage unit. The work panel pivotally carries a utility member which supports the panel when it is horizontal and which frames intelligence on the work panel when it is vertical and serves as a display.

Growing community of inventors

Hockessin, DE, United States of America

John B Adams, Jr