Hot atom reactions involving multivalent and univalent species. Progress report, February 1976--January 1977

Technical Report · Sat Jan 01 04:00:00 EST 1977

DOI:https://doi.org/10.2172/7234481· OSTI ID:7234481

Tang, Y. N.

Multivalent hot atoms formed by the nuclear recoil method were studied: /sup 31/Si, /sup 32/P, and /sup 11/C. For the recoil /sup 31/Si reactions, we have completed the study on the reactivities of conjugated dienes towards monomeric /sup 31/SiF/sub 2/. The relative reactivities of 1,3-butadiene, trans-pentadiene, cis-pentadiene and 2-methyl-1,3-butadiene towards /sup 31/SiF/sub 2/ have been measured as: 1.0:0.89:0.91:1.06 for singlet /sup 31/SiF/sub 2/; and as 1.0:0.80:0.52:0.89 for the triplet. The large steric effect detected here between cis- and trans-pentadienes for their reactivities towards triplet /sup 31/SiF/sub 2/-donor indicates that a direct 1,4-addition process is possible for such /sup 31/SiF/sub 2/ donating complexes. 2-methyl-1,1-diflorosilacyclopent-3-ene and its 3-methyl isomer were successfully synthesized by the co-pyrolysis technique. Experiments to evaluate the relative addition efficiencies of /sup 31/SiH/sub 2/ towards various conjugated dienes; and to study to H- and F-abstraction mechanism by /sup 31/Si atoms were begun. For recoil /sup 32/P reactions, some progress has been made towards evaluating the mechanism of abstraction reactions by recoil /sup 32/P atoms in PF/sub 3/-PCl/sub 3/ system, and the moderator effect for recoil /sup 32/P reactions with PF/sub 3/-CH/sub 4/ mixtures. The possible formation of /sup 32/PH, and the formation of /sup 32/P atoms via the /sup 32/S(n,p)/sup 32/P process have also been explored. For recoil /sup 11/C reactions, major progress has been obtained in the moderator studies of its reactions with 1,3-butadiene. With the successive addition of Ne as a moderator, the yield of acetylene-/sup 11/C decreased, the yield of cyclopentene-/sup 11/C increased while those of both 1,2,4-pentatriene-/sup 11/C and cyclopentadiene-/sup 11/C went through a minimum. Some progress for the identification of the last unknown /sup 11/C-labeled product from this system has also been made.

• Research Organization: Texas A and M Univ., College Station (USA). Research Foundation
• OSTI ID: 7234481
• Report Number(s): ORO-3898-29
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400701* -- Radiochemistry & Nuclear Chemistry-- Hot-Atom Chemistry
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BUTADIENE
CARBON 11
CARBON ISOTOPES
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
DAYS LIVING RADIOISOTOPES
DIENES
EVEN-ODD NUCLEI
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HOT ATOM CHEMISTRY
HOURS LIVING RADIOISOTOPES
HYDROCARBONS
ISOTOPES
LIGHT NUCLEI
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
PENTADIENES
PHOSPHORUS 32
PHOSPHORUS CHLORIDES
PHOSPHORUS COMPOUNDS
PHOSPHORUS FLUORIDES
PHOSPHORUS ISOTOPES
POLYENES
RADIOCHEMISTRY
RADIOISOTOPES
RECOILS
RESEARCH PROGRAMS
SILICON 31
SILICON COMPOUNDS
SILICON FLUORIDES
SILICON ISOTOPES