全文获取类型
收费全文 | 81篇 |
免费 | 0篇 |
专业分类
化学 | 57篇 |
数学 | 1篇 |
物理学 | 23篇 |
出版年
2019年 | 1篇 |
2013年 | 5篇 |
2012年 | 3篇 |
2011年 | 2篇 |
2010年 | 2篇 |
2009年 | 5篇 |
2008年 | 2篇 |
2006年 | 4篇 |
2005年 | 1篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 6篇 |
2000年 | 4篇 |
1999年 | 6篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1988年 | 2篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1976年 | 2篇 |
1974年 | 1篇 |
1973年 | 2篇 |
1966年 | 1篇 |
排序方式: 共有81条查询结果,搜索用时 15 毫秒
1.
2.
Episulfidation of (E)-cyclooctene and (E)-cyclononene was achieved with elemental sulfur by using a catalytic amount of a molybdenum oxo complex. 相似文献
3.
Marco-A. De Paoli R. J. Waltman A. F. Diaz J. Bargon 《Journal of polymer science. Part A, Polymer chemistry》1985,23(6):1687-1698
An electrically conductive plastic material was obtained by the electrochemical polymerization of pyrrole in a poly(vinyl chloride) matrix. The transmission electron microscopy shows that polypyrrole is uniformly distributed in the matrix. The conductivity of the composites fall in the range of 5 to 50 S/cm, and their mechanical properties, as measured in a stress—strain test, are very similar to those of pure poly(vinyl chloride). These can be further improved by addition of poly(chloroprene) rubber as a plasticizer. 相似文献
4.
Starting from the binuclear complex [RhCl(NBD)]2 (NBD = 2,5-norbornadiene) in the presence of the phosphines L = PMe3, PMe2Ph, PMePh2, PEt3, PEt2Ph, PEtPh2, or P(n-butyl)3, various mononuclear dihydrides of the type Rh(H)2CIL3, i.e., those of the homogeneous hydrogenation catalysts RhCIL3, have been obtained upon addition of parahydrogen, and their 1H NMR spectra have been investigated using parahydrogen-induced polarization (PHIP). Furthermore, the two binuclear complexes (H)(Cl)Rh(PMe3)2(mu-Cl)(mu-H)Rh(PMe3) and (H)(Cl)Rh(PMe2Ph)2(mu-Cl)(mu-H)Rh(PMe2Ph) have been detected and characterized by means of this in situ NMR method. Analogous complexes with trifluoroacetate instead of chloride, i.e., Rh(H)2(CF3COO)L3, have been generated in situ starting from Rh(NBD)(acac) in the presence of trifluoroacetic acid in combination with the phosphines L = PPh3, PEt2Ph, PEt3, and P(n-butyl)3, and their 1H NMR parameters have been determined. 相似文献
5.
A two-stage laser ablation process is described, which initially generates a laser-light absorbing image from a conventional photolithographic mask via a UV-flood exposure step. For this purpose a colorless precursor of a dye, i.e., itsleuco form, is imbedded into the polymer to be ablated as a dopant. For poly(methyl methacrylate) as such a polymer, triphenylmethanol, the leuco precursor for the corresponding triphenylmethyl dye represents a good choice for ablation with excimer lasers operating at the wavelength 351 nm. In this fashion conventional masks and exposure tools of UV-photolithography may be used in combination with laser ablation. The resulting images are characterized by a good contrast and reasonably sharp contours. The photochemical mechanism and additional aspects of this two-step process, which resembles the portable conformal mask approach of photolithography, are outlined. 相似文献
6.
7.
The molybdenum oxo complexes 1a and 1b catalyze efficiently the sulfur transfer to a series of alkenes 4 and allenes 6, for which elemental sulfur, phenylthiirane, or methylthiirane have been employed as sulfur sources to afford the corresponding episulfides 5 and 7. The most effective catalytic episulfidation system to date is the combination of the dithiophosphate-ligated oxo complex 1b and phenylthiirane (Ibeta). This metathesis process is efficient enough to convert usually reluctant alkenes (cyclopentene, cycloheptene, Z-cyclooctene, Z-cyclononene, E-cyclodecene, norbornene, and even bicyclopropylidene) to their episulfides in good yields under mild conditions. The direct catalytic sulfuration of allenes (cyclonona-1,2-diene, cyclonona-1,2,5-triene, cyclodeca-1,2-diene, and 2,4-dimethylpenta-2,3-diene) to their labile methylenethiiranes is unprecedented. 相似文献
8.
Adam W Bargon RM Bosio SG Schenk WA Stalke D 《The Journal of organic chemistry》2002,67(20):7037-7041
The direct molybdenum-catalyzed sulfuration of a variety of isonitriles with elemental sulfur or propene sulfide as sulfur donors affords the corresponding isothiocyanates in good yields and under mild reaction conditions. A catalytic cycle is suggested, in which the molybdenum oxo disulfur complex operates as the active sulfur-transferring species. A novel adduct between the isonitrile and the molybdenum complex has been characterized by X-ray analysis and its association constant determined by UV-vis spectroscopy, but this adduct appears not to be involved in the sulfur-transfer process. 相似文献
9.
Andreas Harthun Rüdiger Selke Joachim Bargon 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》1996,108(21):2666-2669
10.
Albrecht M Schlupp M Bargon J van Koten G 《Chemical communications (Cambridge, England)》2001,(18):1874-1875
Sensor devices for the detection of low quantities of SO2 gas have been constructed which comprise organoplatinum receptor sites for the selective recognition of SO2 and a quartz crystal microbalance for the detection of small mass changes at the receptor sites. 相似文献