Showing papers by "Christian V. Stevens published in 1999"
Patent•
08 Jun 1999
TL;DR: In this article, the use as surface active agent of a fructan N-alkylurethane (I) which is composed of saccharide units of the general formula (II): A (O - CO - NH - R)s where R represents a linear or branched, saturated or unsaturated alkyl group containing from 3 to 22 carbon atoms and any mixture thereof.
Abstract: The invention concerns the use as surface-active agent of a fructan N-alkylurethane (I) which is composed of saccharide units of the general formula (II): A (O - CO - NH - R)s wherein A represents a fructosyl unit (F) or a terminal glucosyl unit (G) of said fructan, being a levan or an inulin, with a degree of polymerisation (DP) of minimum 3, (O - CO - NH - R) represents an N-alkylaminocarbonyloxy group replacing a hydroxyl group of the saccharide unit A, wherein R represents a linear or branched, saturated or unsaturated alkyl group containing from 3 to 22 carbon atoms and any mixture thereof, and s represents the number of N-alkylaminocarbonyloxy groups per saccharide unit which is expressed as degree of substitution (DS), and said DS has a value ranging from 0.10 to 2.0. The invention further relates to novel fructan N-alkylurethanes (I), in particular inulin N-alkylurethanes (I), and a method for their manufacture. The fructan N-alkylurethanes (I) have good to excellent surface-active properties in combination with good biodegradability and are suitable as surfactants for use in household and industrial applications, e.g. as detergents, emulsifiers, emulsion stabilisers, foaming agents, foam stabilisers, dispersants and wetting agents.
44 citations
TL;DR: In this paper, 1-Phosphono-2-aza-1, 3-dienes were formed by 1, 4-dehydro-chlorination of the corresponding α-chloroimines and reacted with diazomethane to give 1-vinyl-2phosphonoaziridines.
24 citations
TL;DR: Upon biological screening of a series of African medicinal plants, substantial phytotoxic activity was found in the leaves of Laggera decurrens, and bioassay-guided fractionation of the leaves led to the isolation of two physiologically active compounds, causing death of Lemna minor.
Abstract: Upon biological screening of a series of African medicinal plants, substantial phytotoxic activity was found in the leaves of Laggera decurrens (Vahl.) Hepper & Wood (Asteraceae), using a Lemna min...
12 citations
TL;DR: In this paper, the reaction of 2-chloro-2-acetimidoylbutyrolactones with sodium methoxide or sodium ethoxide in the corresponding alcohol provides a facile one-step synthesis of methyl or ethyl 1-alkyl 2-methylpyrrole-3-carboxylates from readily available starting materials.
5 citations
TL;DR: In this paper, the reaction of 2-chloro-2-acetimidoylbutyrolactones with sodium methoxide or sodium ethoxide in the corresponding alcohol provides a facile one-step synthesis of methyl or ethyl 1-alkyl 2-methylpyrrole-3-carboxylates from readily available starting materials.
Abstract: Reaction of 2-chloro-2-acetimidoylbutyrolactones with sodium methoxide or sodium ethoxide in the corresponding alcohol provides a facile one-step synthesis of methyl or ethyl 1-alkyl-2-methylpyrrole-3-carboxylates from readily available starting materials.