bluuebunny/crossref_metadata_2025_split huggingface dataset:
A New and Convenient Method for the Preparation of Cyclooctanone Containing Bis-Aldol Skeleton by Samarium(II) Iodide-mediated Intramolecular Aldol Cyclization of ω-Oxiranyl Keto Octanal
Authors: Pudhom Khanitha , Arai Hidehiro , Yamane Keiko , Mukaiyama Teruaki 
Published: September 2002

Abstract
A polyoxy eight-membered ring compound containing a bis-aldol skeleton, 2,6-dibenzyloxy-3-(t-butyldimethylsiloxy)-7-hydroxy-8-hydroxymethyl-5-(p-methoxybenzyloxy)-4,4-dimethylcyclooctanone 1, a key synthetic intermediate of 19-hydroxypaclitaxel, was prepared in high yield from 2,6-dibenzyloxy-5-(t-buthyldimethylsiloxy)-3-(p-methoxybenzyloxy)-4,4-dimethyl-8,9-oxiranyl-7-oxononanal 6 by the samarium(II) iodide-mediated intramolecular aldol cyclization.
A “Chemical-Scissors-Assemble” Route to Titanium Carbide Nanorods
Authors: Wang Xinjun , Lu Jun , Gou Pingping , Xie Yi 
Published: September 2002

Abstract
By using tetrachloroethylene (C2Cl4), metallic titanium powders and N-containing nucleophilic solvents, such as ethylenediamine (en), pyridine and diethylamine as raw materials, a new strategy, called “chemical-scissors-assemble” route, is explored to prepare TiC nanorods, in which nucleophilic solvent attacks at the carbon in tetrachloroethylene to remove the chlorine groups and produce free C2, which can assemble into one-dimensional conjugate carbon chain clusters, and then react with Ti powders and result in a one-dimensional structure of TiC nanorods.
Synthesis and Electrochemical Properties of Yttrium-doped Spinel LiMn2−yYyO4 Cathode Material
Authors: Tang Hao , Feng Chuan Qi , Fan Quan , Lei Tai Ming , Sun Ju Tang , Yuan Liang Jie , Zhang Ke Li 
Published: September 2002

Abstract
Yttrium doped spinel LiMn2−yYyO4 with single phase was synthesized and characterized. The data of the XRD show that the limit for Y solubility is y≤0.02. The beneficial effect of Y is evident by way of improved cyclability. The electrode of LiMn1.98Y0.02O4 shows excellent electrochemical properties with a first discharge capacity of 118 mA·h·g−1 and retaining 98% of the initial capacity after 100 cycles at the current rate 0.2 C.
A Novel Diphenylmaleimide Dye for Fluorescence Photopatterned Images
Authors: Yang Nam Choul , Choi Ho Wook , Lee Jun Kyu , Hwang Jo Il , Suh Dong Hack 
Published: September 2002

Abstract
A novel fluorescent diphenylmaleimide dye, 1–BOC, can be converted into non–fluorescent 1–OH by the deprotection of the tert–butyloxycarbonyl group of 1–BOC with photogenerated acid, which makes 1–BOC of an useful material for fluorescence images patterned by a photolithographic method based on chemical amplification concept.
Vacuum-Ultraviolet Circular Dichroism of Amino Acids as Revealed by Synchrotron Radiation Spectrophotometer
Authors: Matsuo Koichi , Matsushima Yosuke , Fukuyama Takayuki , Senba Shinya , Gekko Kunihiko 
Published: September 2002

Abstract
We succeeded in constructing a vacuum-ultraviolet circular dichroism (VUVCD) spectrophotometer with a small-scale synchrotron radiation source (0.7 GeV) at Hiroshima Synchrotron Radiation Center (HiSOR). This VUVCD system revealed for the first time the CD spectra of amino acids in aqueous media in the 310–140 nm region under high vacuum. These data, which cannot be observed by any types of existing CD spectrophotometers, now open a new field in the structural analysis of biomaterials on a basis of the higher energy transition of chromophores.
Novel Catalysts for Carbon Dioxide-induced Selective Conversion of Methane to C2 Hydrocarbons
Authors: Cai Yingchun , Chou Lingjun , Li Shuben , Zhang Bing , Zhao Jun 
Published: September 2002

Abstract
The combination of Mn with BaCO3 leads to active catalysts for carbon dioxide-induced selective conversion of methane to ethane and ethylene in the absence of oxygen.
Stereoselectivity in the Fe(II)/Cu(II)-mediated Homolytic Decomposition of the cis- and trans-Isomers of Pinane Hydroperoxide
Authors: Lempers H E B , Sheldon R A , Swift K A D 
Published: September 2002

Abstract
The outcome of the FeSO4/CuSO4-mediated homolytic decomposition of 2,6,6-trimethylbicyclo[3.1.1]heptane-2-hydroperoxide (pinane hydroperoxide, PHP) was found to be markedly dependent on its stereochemical configuration. The cis-isomer gave exclusively 1-(2,2-dimethyl-3-vinylcyclobut-1-yl)ethanone via beta-scission of the intermediate alkoxy radical followed by oxidation of the ensuing alkyl radical by CuSO4. In contrast, trans-PHP afforded the tricyclic ether 1,4-dimethyl-3-oxatricyclo[5.2.0.0 4,9]nonane, via intramolecular hydrogen abstraction and CuSO4 oxidation of the resulting alkyl radical, as the major product.
Crystal Structure and Magnetic Properties of Two-dimensional Cyanide-bridged Bimetallic Assembly Composed of CsI[MnII(3-cyanopyridine)2{WV(CN)8}]·H2O
Authors: Arimoto Yoichi , Ohkoshi Shin-ichi , Zhong Zhuang Jin , Seino Hidetake , Mizobe Yasushi , Hashimoto Kazuhito 
Published: September 2002

Abstract
We have synthesized a two-dimensional manganese(II) octacyanotungstate(V)-based ferrimagnet with a magnetic ordering temperature of 35 K. Single crystal analysis showed that MnII ion was axially capped by 3-cyanopyridines, forming a two-dimensional structure. This bimetallic assembly showed ferrimagnetic properties due to the antiferromagnetic interaction between magnetic orbitals of dz2 on WV ion and dx′y′ on MnII ion in the inside of the two dimensional layer.
Host-Guest Electron Transfer between Intercalated Co(II)-Tetraphenylporphine Tetrasulfonate and Mg–Fe(III) Layered Double Hydroxides
Authors: Shichi Tetsuya , Tong Zhiwei , Hirai Shu , Takagi Katsuhiko 
Published: September 2002

Abstract
An electron transfer between Fe(III) of Mg–Fe(III) LDH (Layered Double Hydroxide) and Co(II)TPPS (cobalt(II)-tetraphenylporphine tetrasulfonate) as the guest was investigated. With a low coverage of the guest, the electron transfer occurred during the adsorption process to form an intercalation hybrid. On the other hand, light irradiation (&gt;400 nm) of the hybrid powder resulted in a reverse electron transfer to Co(II)TPPS/Mg–Fe(III) LDH. Structural changes in the laminating hybrid were observed to take place concurrently with the electron transfers.
Low Pressure Hydroformylation in the Presence of Alcohol Promoters
Authors: Li Baitao , Li Xiaohong , Asami Kenji , Fujimoto Kaoru 
Published: September 2002

Abstract
Active carbon supported cobalt catalyst was studied for the hydroformylation of 1-hexene in the presence of alcohol solvents at low pressure. The influence of various solvents on the hydroformylation and the CO conversion vs time on stream were investigated in detail. It was found that the heterogeneous catalyst shows excellent activity only in the alcohol solvents.
Reduction of Nitrate and Nitrite Ions over Ni-ZnS Photocatalyst under Visible Light Irradiation in the Presence of a Sacrificial Reagent
Authors: Hamanoi Osamu , Kudo Akihiko 
Published: September 2002

Abstract
Ni-doped ZnS photocatalysts (Zn0.999Ni0.001S) with a 2.4 eV energy gap showed activities for the reduction of nitrate and nitrite ions to nitrite, ammonia, and dinitrogen under visible light irradiation (λ&gt;420 nm) in the presence of methanol as a reducing reagent. The reduction of nitrate ions competed with that of water to form dihydrogen. The concentration of nitrate ions and loading a platinum cocatalyst affected the selectivity for the reduction products of nitrate ions.
A Novel Spinel-Type Co/Mn Catalyst for Methane Oxidation at Low Temperatures
Authors: Li Weibin , Lin Ying 
Published: September 2002

Abstract
A Spinel-type Co/Mn catalyst prepared in a sol-gel process has been investigated for catalytic oxidation of methane. The reaction activity was significantly improved by either pretreating the catalyst in the presence of water vapor or addition of water vapor into the feed gas. XPS spectra show that the oxidation activity was closely related with surface Co species and the intensity ratio of lattice oxygen to adsorbed oxygen on the sample.
Novel Alkoxo-Bridged Lanthanide(III) Dinuclear Complexes: Crystal Structure of Na4[Yb2(μ-dpta-O)2] (H4dpta-OH=1,3-Diamino-2-hydroxypropane-N,N,N′,N′-tetraacetic acid)
Authors: Miyashita Yoshitaro , Sanada Masateru , Yamada Yasunori , Fujisawa Kiyoshi , Okamoto Ken-ichi 
Published: September 2002

Abstract
Novel alkoxo-bridged lanthanide(III) dinuclear complexes Na4[Ln2(μ-dpta-O)2] (Ln=GdIII, HoIII, and YbIII; H4dpta-OH=1,3-diamino-2-hydroxypropane-N,N,N′,N′-tetraacetic acid) were prepared and characterized. X-ray analysis for the Yb(III) complex indicated that each Yb atoms, which is surrounded by four terminal O atoms from carboxylate, two bridged O atoms from alkoxo, and two N atoms in two different dpta-O ligands, is situated in an eight coordinate geometry.
Observation of Energy-Filtered Image for X-Ray Photoemission Electron Microscopy (EXPEEM) Using a Retarding Wien-Filter Energy Analyzer
Authors: Yasufuku Hideyuki , Ohminami Yusuke , Tsutsumi Tetsuya , Asakura Kiyotaka , Kato Makoto , Sakai Yuji , Kitajima Yoshinori , Iwasawa Yasuhiro 
Published: September 2002

Abstract
We observed surface images of the Au islands periodically deposited on a Ta sheet by means of an energy-filtered XPEEM using a retarding Wien-filter energy analyzer and a high energy X-ray. By changing the passing photoelectron kinetic energy (Ekin), we had a brighter Au island image at the Ekin=0 eV and 60 eV while we had a brighter Ta substrate image at Ekin=102 eV, corresponding to a Ta 3p3/2 photoelectron peak.
Structures and Magnetic Properties of Di and Tetranuclear Nickel(II) Complexes with Schiff Base Ligands
Authors: Hoshino Norihisa , Ito Tasuku , Nihei Masayuki , Oshio Hiroki 
Published: September 2002

Abstract
Reactions of Ni(CH3COO)2·4H2O and NiCl2·6H2O with Schiff base ligands yielded di and tetranuclear nickel(II) complexes of [Ni2(Hhsae)2(CH3COO)2(MeOH)2] (1) and [Ni4(sae)4(MeOH)4] (2) (H2hsae=2-(5-hydroxysalicylideneamino)ethanol and H2sae=2-salicylideneaminoethanol). Magnetic susceptibility measurements revealed that 1 and 2 have singlet and nonet spin ground states, respectively.
Highly Enantioselective Intramolecular Cyclopropanation of Alkenyl Diazo Ketones Using Ru(salen) as Catalyst
Authors: Saha Biswajit , Uchida Tatsuya , Katsuki Tsutomu 
Published: September 2002

Abstract
Intramolecular cyclopropanation of alkenyl diazoketones was found to proceed in a highly enantioselective manner by using optically active (nitroso)(salen)ruthenium(II) complex 1 as the catalyst under photo-irradiation.
Molecular Assembly of Zinc–Nickel Hybrid Porphyrin Dimer Using Synthetic 4α-Helix Polypeptides
Authors: Takeuchi Yoshito , Watanabe Hiroyuki , Kashiwada Ayumi , Nagata Morio , Ohtsuka Toshiaki , Nishino Norikazu , Kawai Hideki , Nagamura Toshihiko , Kurono Yukihisa , Oku Naoto , Nango Mamoru 
Published: September 2002

Abstract
Molecular assembly of hybrid porphyrin dimer containing zinc and nickel mesoporphyrins using synthetic 4α-helix polypeptides induced an efficient energy-transfer between the porphyrins due to the presence of the polypeptide.
Olefin Metathesis over Mesoporous Alumina-supported Rhenium Oxide Catalyst
Authors: Onaka Makoto , Oikawa Takashi 
Published: September 2002

Abstract
Rhenium oxide finely dispersed on mesoporous alumina with uniform pore size was found to be a more active and selective catalyst for liquid-phase metathesis reactions of terminal and inner olefins than rhenium oxide on normal γ-alumina with random pore shape.
Direct Synthesis of Hydrogen Peroxide (&gt;1 wt%) over the Cathode Prepared from Active Carbon and Vapor-Grown-Carbon-Fiber by a New H2–O2 Fuel Cell System
Authors: Yamanaka Ichiro , Hashimoto Toshihide , Otsuka Kiyoshi 
Published: September 2002

Abstract
A higher concentration of H2O2 solution (&gt;1 wt%) was catalytically and directly synthesized from O2 and H2 over a [active carbon+vapor-grown-carbon-fiber] cathode by a new type of fuel cell system at 1 atm.
Synthesis of CeO2 Spherical Fine Particles by Homogeneous Precipitation Method with Polyethylene Glycol
Authors: Uekawa Naofumi , Ueta Masayuki , Wu Yong Jun , Kakegawa Kazuyuki 
Published: September 2002

Abstract
CeO2(IV) fine particles were prepared by heating a polyethylene glycol solution of Ce(NO3)3·6H2O at 383 K for 3 h. When a polyethylene glycol whose molecular weight was 7500 or 20000 was used for the preparation, the obtained CeO2 particles were almost monodispersed.
Spin Structure and Dynamics in a Spin 1/2 One Dimensional Antiferromagnet, [NiBr(chxn)2]Br2 (chxn: 1R,2R-cyclohexanediamine)
Authors: Takaishi Shinya , Kano Masataka , Kitagawa Hiroshi , Furukawa Yuji , Kumagai Ken-ichi , Ikeda Ryuichi 
Published: September 2002

Abstract
The 1H NMR spin-lattice relaxation time T1 in a spin 1/2 1-D antiferromagnetic complex [NiBr(chxn)2]Br2 was observed down to 1.8 K. The observed T1 temperature dependence was well reproduced by the Sachdev’s treatment giving an exchange interaction energy (J) of ca. 2500 K. 1-D spin migration assignable to paramagnetic electrons in impurity amounts of NiII sites was observed at low temperatures.
Lithium Pyrrolidone Catalyzed Aldol Reaction between Aldehyde and Trimethylsilyl Enolate
Authors: Fujisawa Hidehiko , Mukaiyama Teruaki 
Published: September 2002

Abstract
Lithium pyrrolidone catalyzed aldol reaction between trimethylsilyl enolates and aldehydes proceeded smoothly in a DMF or pyridine solvent to afford the corresponding aldols under weakly basic conditions.
Heterogeneous Photo-Fenton Degradation of an Azo Dye in Aqueous H2O2/Iron Oxide Dispersions at Neutral pHs
Authors: He Ju , Tao Xia , Ma Wanhong , Zhao Jincai 
Published: September 2002

Abstract
The photodegradation of Mordant Yellow 10 (MY10), a kind of azo dye, in aqueous dispersions of H2O2/hematite (α-Fe2O3), goethite (α-FeOOH) and akaganeite (β-FeOOH) at neutral pHs under UV-light irradiation was examined. The fastest degradation rate of MY10 was obtained with goethite. The formation of •OH in the photoreaction process was detected by ESR spin-trapping technique. A possible mechanism of heterogeneous photo-Fenton reaction was proposed.
First Asymmetric Photosensitization in Supercritical Fluid. Exceptionally High Pressure/Density Dependence of Optical Yield in Photosensitized Enantiodifferentiating Isomerization of Cyclooctene
Authors: Saito Ryota , Kaneda Masayuki , Wada Takehiko , Katoh Akira , Inoue Yoshihisa 
Published: September 2002

Abstract
The photosensitized enantiodifferentiating isomerization of (Z)-cyclooctene (1Z) in supercritical carbon dioxide has been performed for the first time. The critical control of the enantiomeric excess (ee) of chiral product, (E)-cyclooctene (1E), and even the switching of the product’s chirality were achieved through a small change of pressure particularly in the low-density region near the critical density. Quantitative evaluation of these ee changes was achieved by estimating differential activation volumes between the diastereomeric transition states of the reaction.
Fabrication of Hierarchical Structured Zeolitic Materials through Vapor-phase Transforming of the Seeded Diatomite
Authors: Wang Yajun , Tang Yi , Wang Xingdong , Shan Wei , Dong Angang , Ren Nan , Gao Zi 
Published: September 2002

Abstract
Here, we report a new simple approach to the preparation of hierarchical structured zeolites through transforming the seeded diatomaceous silica into zeolite by vapor-phase transport (VPT) method. The morphology and macro-porosity of the diatomite are well preserved even in the samples with zeolite content higher than 50%. The products possess high mechanical strength and hydrothermal stability.
Enhanced Photocurrent of Dye-Sensitized Solar Cells by Modification of TiO2 with Carbon Nanotubes
Authors: Jung Kyoung-hwa , Hong Jin Sup , Vittal R , Kim Kang-Jin 
Published: September 2002

Abstract
The effect of incorporating single-wall carbon nanotubes in TiO2 film electrodes on the properties of dye-sensitized solar cells was studied. Compared with an unmodified solar cell, it is observed that the short-circuit photocurrent (Jsc) of the modified solar cells increases while the open-circuit photovoltage decreases slightly. The enhanced Jsc is correlated with increased electrical conductivity, light scattering and concentration of free conduction band electrons.
Efficient Synthesis of a Donor-Acceptor Phthalocyanine Having Adjacently-Fused Pyrazine Rings
Authors: Fukuda Takamitsu , Kobayashi Nagao 
Published: September 2002

Abstract
Condensation reaction of 3,6-diphenylphthalonitrile and 2,3-dicyano-5,6-diethyl-1,4-pyrazine employing the modified lithium method has efficiently produced the novel donor-acceptor phthalocyanine derivatives having adjacently-fused pyrazine rings.
Ruthenium Oxyl Radical Complex Containing o-Quinone Ligand Detected by ESR Measurements of Spin Trapping Technique
Authors: Kobayashi Katsuaki , Ohtsu Hideki , Wada Tohru , Tanaka Koji 
Published: September 2002

Abstract
Ruthenium-quinone complex containing an aqua ligand, [RuII(trpy)(35tBu2Q)(OH2)](ClO4)2 (trpy=2,2′:6′,2″-terpyridine, 35tBu2Q=3,5-di-tert-butyl-1,2-benzoquinone) underwent deprotonation of an aqua ligand accompanied with intramolecular electron transfer from O2− ligand to quinone ligand generating O•− ligand.
A New Process for Producing Ca/Mg Acetate Deicer with Ca/Mg Waste and Acetic Acid Produced by Wet Oxidation of Organic Waste
Authors: Jin Fangming , Kishita Atsushi , Moriya Takehiko , Enomoto Heiji , Sato Naohiro 
Published: September 2002

Abstract
A new process for producing calcium magnesium acetate (CMA) deicer with acetic acid, produced by wet oxidation of organic wastes, and Ca/Mg wastes is proposed. Four kinds of representative organic waste were used as low-cost raw materials, for production of acetic acid, which was then converted to CMA by mixing with a Ca/Mg source such as oyster shells and industrial Mg wastes. The conversion efficiencies to acetic acid and from acetic acid to CMA achieved 14–16% and higher than 99%, respectively.
Novel Synthesis and Thermal Ring Fission of 7-Aryl-1,2,3,4,5,7-pentathiazocanes
Authors: Shimada Kazuaki , Yoshida Takamasa , Makino Kenshiro , Otsuka Tatsuya , Onuma Yuki , Aoyagi Shigenobu , Takikawa Yuji , Kabuto Chizuko 
Published: September 2002

Abstract
Treatment of 1,5,3,7-dithiadiazocanes 1 with bromine-elemental sulfur or disulfur dichloride (S2Cl2) afforded 1,2,3,4,5,7-pentathiazocanes 3, and heating of 3 caused unusual thermal ring fission to give an inseparable mixture of polysulfide chains bearing a thioformamide moiety on each terminal.
A Synthesis of AB-Ring Model System of Taxane Framework by Way of Intramolecular Knoevenagel Cyclization
Authors: Arai Hidehiro , Ohno Ayako , Tani Yu-ichirou , Imachi Shouhei , Mukaiyama Teruaki 
Published: September 2002

Abstract
Methyl 1,2-dialkoxy-11,11-dimethyl-9-oxobicyclo[5.3.1]-undec-7-en-8-carboxylate 19 was synthesized by cesium fluoride-mediated intramolecular Knoevenagel reaction of methyl 4-(1,8-dialkoxy-2,2-dimethyl-3-oxocyclooctyl)-3-oxobutanonate 18.
Formation of Uniform Mesopores in ZSM-5 Zeolite upon Alkaline Post-treatment?
Authors: Groen J C , Pérez-Ramírez J , Peffer L A A 
Published: September 2002

Abstract
Alkaline post-treatment (0.2 M NaOH at 353 K) of ZSM-5 leads to substantial formation of mesoporosity. The created mesopores do not have a uniform size of 4 nm,1 but show a broad distribution around 10 nm. The sharp peak at 4 nm in the pore size distribution derived from the N2 desorption isotherm should be attributed to the Tensile Strength Effect of the adsorbate instead.
Orange Emission of TbF3-Containing Fluoride Oxide Glass
Authors: Takashima Masayuki , Yonezawa Susumu , Nishibu Shiori 
Published: September 2002

Abstract
A new fluoride oxide glass containing TbF3 was prepared in the composition of xTbF3·20BaF2·10AlF3·(70-x)GeO2 (x=10-40). The temperature of melt was 1200 °C. The glass transition temperatures were 600–800 °C, depending on composition. Fluorescence spectra of the glasses were changed with Tb3+ concentration. The color of emission light changed from green to orange for x=10-30 and from orange to green for x=30-40.
Ultrasound-Assisted Self-Regulation Route to Ag Nanorods
Authors: Xiong Yujie , Xie Yi , Du Guoan , Liu Xianming , Tian Xiaobo 
Published: September 2002

Abstract
An ultrasound-assisted self-regulation route was reported to prepare silver nanorods. Ag nanorods were obtained from a mixture of AgNO3 and gallic acid, with 1,10-phenanthroline as a type of coordination agent to regulate the products, under the ultrasonic condition.
Early Tecovirimat Treatment for Mpox Disease Among People With HIV
Authors: Aldred Bruce , Lyles Robert H. , Scott Jane Y. , Gromer Daniel J. , Aldredge Amalia , Workowski Kimberly A. , Wiley Zanthia , Titanji Boghuma K. , Szabo Brittany , Sheth Anandi N. , Rebolledo Paulina A. , Nguyen Minh Ly , Marconi Vincent C. , Kelley Colleen F. , Kandiah Sheetal , Kalapila Aley , Jacob Jesse T. , Hall Betsy , Colasanti Jonathan A. , Cartwright Emily J. , Cantos Valeria D. 
Published: January 2024

ImportanceDespite a lack of effectiveness data in humans, tecovirimat was widely prescribed to people with HIV (PWH) with mpox during the 2022 mpox epidemic, particularly PWH with low CD4+ T-cell counts or severe mpox clinical manifestations.ObjectiveTo evaluate if PWH with mpox who were treated with tecovirimat within 7 days of symptom onset were less likely to have mpox disease progression.Design, Setting, and ParticipantsThis cohort study included PWH diagnosed with mpox at 4 hospitals in Atlanta, Georgia, between June 1 and October 7, 2022. Patients were grouped according to whether they were treated with tecovirimat within 7 days of mpox symptom onset (early tecovirimat cohort) or they did not receive tecovirimat or received the drug 7 or more days after symptom onset (late or no tecovirimat cohort). Multivariable logistic regression models were used to identify factors associated with progression of mpox disease. The 2 cohorts were then matched 1:1 using propensity scores based on the identified factors, and mpox disease progression was compared.ExposuresTreatment with tecovirimat within 7 days of mpox symptom onset.Main Outcome and MeasuresProgression of mpox disease, defined as the development of at least 1 severe mpox criterion established by the US Centers for Disease Control and Prevention, after symptom day 7.ResultsAfter propensity score matching, a total of 112 PWH were included in the analysis; 56 received tecovirimat within 7 days of mpox symptom onset (early tecovirimat group) and 56 were either treated later or did not receive tecovirimat (late or no tecovirimat group). In the early tecovirimat group, the median (IQR) age was 35 (30-42) years; 54 individuals (96.4%) were cisgender men, 46 (82.1%) were Black individuals, and 10 (17.9%) were individuals of other races (American Indian or Alaska Native, Asian, Native Hawaiian or Other Pacific Islander, or White) or unknown race. In the late or no tecovirimat group, the median (IQR) age was 36 (32-43) years; 54 (96.4%) were cisgender men, 49 (87.5%) were Black individuals, and 7 (12.5%) were individuals of other races or unknown race. Mpox disease progression occurred in 3 PWH (5.4%) in the early tecovirimat group and in 15 PWH (26.8%) in the late or no tecovirimat group (paired odds ratio, 13.00 [95% CI, 1.71-99.40]; P = .002).Conclusion and RelevanceResults of this cohort study support starting tecovirimat in all PWH as soon as an mpox diagnosis is suspected. Additional research is warranted to confirm these findings.