نتایج جستجو برای: carbonates

تعداد نتایج: 9055  

2007
Jay Quade John Eiler

Paleoelevation reconstruction using stable isotopes, although a relatively new science, is making a signifi cant contribution to our understanding of the recent growth of the world’s major orogens. In this review we examine the use of both light stable isotopes of oxygen and the new “clumped-isotope” (Δ47) carbonate thermometer in carbonates from soils. Globally, the oxygen isotopic composition...

2015
Yanfei Zhao Zhenzhen Yang Bo Yu Hongye Zhang Huanjun Xu Leiduan Hao Buxing Han Zhimin Liu

The hydration of propargylic alcohols is a green route to synthesize a-hydroxy ketones. Herein a CO2reactive ionic liquid (IL), [Bu4P][Im], was found to display high performance for catalyzing the hydration of propargylic alcohols in the presence of atmospheric CO2, and a series of propargylic alcohols could be converted into the corresponding a-hydroxy ketones in good to excellent yields. In t...

Journal: :Scientific American 1894

2014
Huixin Liu Renqin Zeng Ruimao Hua

An efficient coupling reaction of epoxides with CO2 affording cyclic carbonates with the use of 2,2',2''-terpyridine as catalyst under solvent-free conditions has been developed.

2015
Ludmila Adam K. T. Lewallen Kasper van Wijk L. Adam M. Batzle K. van Wijk

Journal: :Symposium - International Astronomical Union 2003

Journal: :Rapid communications in mass spectrometry : RCM 2014
Malcolm T McCulloch Michael Holcomb Kai Rankenburg Julie A Trotter

RATIONALE The isotopic composition and elemental abundance of boron (B) in marine carbonates provide a powerful tool for tracking changes in seawater pH and carbonate chemistry. Progress in this field has, however, been hampered by the volatile nature of B, its persistent memory, and other uncertainties associated with conventional chemical extraction and mass spectrometric measurements. Here w...

Journal: :Chemical communications 2009
Yasutaka Yatsumonji Yuichiro Atake Akira Tsubouchi Takeshi Takeda

Conjugated dienes were produced with complete regio- and stereoselectivity by the titanocene(ii)-promoted alkylation of propargyl carbonates via the formation of 2,3,4-trisubstituted titanacyclobutenes.

Journal: :Journal Of Geophysical Research: Solid Earth 2021

Complex conductivity measurements of carbonate rocks are scarce despite the occurrence these at surface Earth. The complex spectra 57 samples were measured in a broad frequency range and four salinities (NaCl). A simple model induced polarization is developed to be applied field. in-phase (related conduction) reported as function pore water determine (intrinsic) formation factor conductivity. n...

2008
Guillaume Le Hir Yannick Donnadieu Yves Goddéris Raymond T. Pierrehumbert Galen P. Halverson Mélina Macouin Anne Nédélec Gilles Ramstein

Article history: Carbonates capping Neop Received 22 May 2008 Received in revised form 10 October 2008 Accepted 10 November 2008 Available online xxxx Editor: P. DeMenocal

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