Multiple Trichobezoars and Laparotomies

Gastric trichobezoar associated with transient pancreatitis.

“…Therefore, psychiatric consultation and a long follow up period are necessary as recurrence of trichophagia and eventually trichobezoar could occur. 6 …”

Energetic preference of dative fluorine manganese bonds over direct manganese manganese bonds in binuclear hexafluorocyclopentadiene manganese carbonyls

“…However, in the cobalt complex ( 3 , 1 -C 5 F 6 )Co 2 (CO) 7 the C 5 F 6 ligand is a trihapto-monohapto ligand with three of its four sp 2 carbons bonded to a Co(CO) 3 moiety and the fourth sp 2 carbon bonded to a Co(CO) 4 moiety. These bonding modes of the C 5 F 6 ligand in ( 2 , 2 -C 5 F 6 )Fe 2 (CO) 8 and ( 3 , 1 -C 5 F 6 )Co 2 (CO) 7 give each transition metal atom in these structures the favored 18-electron configuration.…”

“…However, further study of this complex indicated that two tetrafluoroethylene ligands had coupled to form a ferracyclopentane derivative (CF 2 ) 4 Fe(CO) 4 containing a five-membered C 4 Fe ring ( Figure 1). 4,5 Nevertheless, Haszeldine and coworkers 6,7 found the reaction of tetrafluoroethylene with Co 2 (CO) 8 under mild conditions to give initially a yellow solid formulated as (OC) 4 CoCF 2 CF 2 Co(CO) 4 with an intact monomeric tetrafluoroethylene ligand bridging two Co(CO) 4 unit by forming -bonds to their cobalt atoms ( Figure 1). However, this solid reversibly loses CO under mild conditions to give a red product shown to be (µ-CF 3 CF)Co 2 (CO) 6 (µ-CO) in which a Co-Co bond is bridged both by a trifluoromethylfluorocarbene ligand and a CO group (Figure 1).…”

“…In fact, efforts by Seppelt and coworkers to synthesize C 5 F 5 metal complexes from hexafluorocyclopentadiene were unsuccessful. 10 Thus the C 5 F 6 complexes ( 2 , 2 -C 5 F 6 )Fe 2 (CO) 8 and trans-( 3 , 1 -C 5 F 6 )Co 2 (CO) 7 are obtained from reactions of hexafluorocyclopentadiene with Fe 2 (CO) 9 and Co 2 (CO) 8 , respectively ( Figure 2). 11,12 For comparison, the corresponding reaction of Fe 2 (CO) 9 with cyclopentadiene (C 5 H 6 ) under mild conditions gives initially the tetrahapto diene complex 13 ( 4 -C 5 H 6 )Fe(CO) 3 .…”

“…Application of the 18-electron rule suggests that decarbonylation of ( 2 , 2 -C 5 F 6 )Fe 2 (CO) 8 and ( 3 , 1 -C 5 F 6 )Co 2 (CO) 7 should give structures with formal metal-metal bonds. Previous papers have explored such possibilities for both the iron 18 and cobalt 19 systems using density functional theory.…”