The Reaction of 1-Alkynes with Organometallic Compounds. II. The Relationship between Decomposition Potentials of Grignard Reagents and Their Relative Reactivity Towards Terminal Acetylens

1955 ◽  
Vol 77 (16) ◽  
pp. 4410-4410 ◽  
Author(s):  
Raymond E. Dessy ◽  
C.A. Hollingsworth ◽  
John H. Wotiz
Keyword(s):  
Organometallic Compounds ◽  
Relative Reactivity ◽  
Grignard Reagents ◽  
The Relationship

Relative reactivities of organometallic compounds. XI Grignard reagents

2010 ◽  
Vol 55 (7) ◽  
pp. 577-585 ◽  
Author(s):  
Henry Gilman ◽  
Edith L. St. John ◽  
Nina B. St. John ◽  
Myrl Lichtenwalter
Keyword(s):  
Organometallic Compounds ◽  
Grignard Reagents

scholarly journals Water opens the door to organolithiums and Grignard reagents: exploring and comparing the reactivity of highly polar organometallic compounds in unconventional reaction media towards the synthesis of tetrahydrofurans

2016 ◽  
Vol 7 (2) ◽  
pp. 1192-1199 ◽  
Author(s):  
Luciana Cicco ◽  
Stefania Sblendorio ◽  
Rosmara Mansueto ◽  
Filippo M. Perna ◽  
Antonio Salomone ◽  
...  
Keyword(s):  
Organometallic Compounds ◽  
Grignard Reagents ◽  
Nucleophilic Additions ◽  
Organolithium Reagents ◽  
Reaction Media

Grignard and organolithium reagents undergo smooth nucleophilic additions to γ-chloroketones “on water”.

Interstellar gas in the central region of the Galaxy

1967 ◽  
Vol 31 ◽  
pp. 239-251 ◽  
Author(s):  
F. J. Kerr
Keyword(s):  
Central Region ◽  
Galactic Plane ◽  
Neutral Hydrogen ◽  
Continuum Emission ◽  
Galactic Centre ◽  
Interstellar Gas ◽  
Hydrogen Recombination ◽  
The Galaxy ◽  
Centre Region ◽  
The Relationship

A review is given of information on the galactic-centre region obtained from recent observations of the 21-cm line from neutral hydrogen, the 18-cm group of OH lines, a hydrogen recombination line at 6 cm wavelength, and the continuum emission from ionized hydrogen.Both inward and outward motions are important in this region, in addition to rotation. Several types of observation indicate the presence of material in features inclined to the galactic plane. The relationship between the H and OH concentrations is not yet clear, but a rough picture of the central region can be proposed.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

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