Preparation of (R)-(-)-6,6'-Bis(3,5-dinitrobenzamido)biphenyl-2,2'-dicarboxylic Acid, a Potential Chiral HPLC Selector
作者:Miloš Tichý、Jiří Závada
DOI:10.1135/cccc19952161
日期:——
The title optically active diacid I has been prepared as a potential selector for chiral stationary phase in the HPLC separation of enantiomers.
具有光学活性的二元酸已被制备为HPLC对映体分离中的手性固定相的潜在选择器。
ORGANIC ELECTROLUMINESCENT DEVICE
申请人:Merck Patent GmbH
公开号:US20140249308A1
公开(公告)日:2014-09-04
The present invention relates to electronic devices, in particular organic electroluminescent devices, comprising compounds of the formula (1), to the corresponding compounds, and to a process for the preparation of these compounds.
We evaluated treatments designed to remove saltcedar (Tamarix ramosissima) monocultures from riparian habitats using root plows (mechanical treatment) and aerial applications of the herbicide imazapyr (chemical treatment) within twelve 4-ha impoundments in the Middle Rio Grande Valley in central New Mexico, USA. Following these treatments, impoundments were flooded and water levels were reduced to stimulate native species re-establishment from seed. Water manipulations within saltcedar-removal areas consisted of stage drawdowns of 5 cm/day and 10 cm/day. Mechanically cleared areas had fewer saltcedar resprouts (26 resprouts/ha) than chemically treated areas (2,500 resprouts/ha). Saltcedar and cottonwood (Populus deltoides subsp. wislizinii) seedling density and cottonwood survival were greater in mechanically treated areas than in chemically treated areas. This effect is attributed to soil disturbance resulting from root plowing. Cottonwood seedling density and survival did not differ between 5 cm/day and 10 cm/day stage drawdowns and decreased throughout summer as a result of excessive moisture stress. The absence of a drawdown treatment effect indicates that both drawdowns were too fast for seedling roots to keep up with declining water tables. Seedlings that survived were using moisture from the unsaturated zone.