Selenium Dioxide: Preparation, Properties, and Use as Oxidizing Agent.

Waitkins, G. R.; Clark, C. W.

doi:10.1021/cr60115a001

Cited by 108 publications

(55 citation statements)

References 59 publications

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“…The lines ar e indexed in accordan ce wi th th e structure and unit-cell dimensions determined by M cC ullough [23] in 1937. The mater ial is h ygro copic; lines from th c monoh~Tdrate are omit ted from t h e pattern give n in table 6. Although th e cr ys tals gen erally have been described as monoclinic [24], th e N BS pa ttern confirms the work of 11cC ullo ngh, showing a te tragonal s tru cture . M cCullou gh gives the uni t cell dimensions a = .353, c= 5.…”

Section: S 8eleniwn Dioxide 8e02supporting

confidence: 70%

Standard x-ray diffraction patterns

Swanson¹,

Tatge²

1951

J. RES. NATL. BUR. STAN.

268

225

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Improve ment of t he X -ray diffraction pattern file of t he America n Society fo r T esti ng M aterials is t he bas is for work being don e at t he N ational Bureau of Standards wi t h t he cooperat ion of t he Joint Co mmi ttee on Che mical Analysis by X -ray Diffraction Methods of t he Ameri can Society for T est ing Materials , t he America n Cr ystallographic Associa t ion, an d t he Bri tish Inst it ute of Phy sics. The equipment used in obtainin g t he d ata presented her e comprises a Geiger-count er spectrometer wit h a 180 0 ar c calibrated with t he calculat ed patterns of substances whose lattice const ants are known with high pr ecision . Separate chart s are prep ared to ob tain dat a for interplanar spa cing and intensity m easurements so t hat special attention can be paid t o mounting t he sample for t he best result s in each case. Tables are in cluded t o com pare t he patterns with t hose recorded in the literature.T ables a nd discussion follow for X-ray diffraction dat a ba sed on fou r compounds not listed in t he Ameri can Society for T esting M aterials file and on four represented there. T he pa tterns of zinc borate, Zn B20 4 ; selenium oxide, Se0 2; m agnesium silicate (forsterite ), M g2Si0 4 ; and magnesium t un gstate, Mg W04 , a re recommended as additions to t he file. The patterns of st r ontium nitrate, Sr (N 0 3h; bari um ni trate, Ba (N 0 3h ; lead fluochloride (matlockite) , PbFCI; and mcr cu ric chl oride, H gCh, are reco mmend ed to replace t he present patterns in t he fil e.

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Section: S 8eleniwn Dioxide 8e02supporting

confidence: 70%

Standard x-ray diffraction patterns

Swanson¹,

Tatge²

1951

J. RES. NATL. BUR. STAN.

268

225

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“…With the key cyclization product (À)-16 a in hand, we set out to explore the late-stage allylic C À Ho xidation (Scheme 3). and hydroxylation (SeO 2 , [17] SeO 2 /tBuOOH, [17] CuCl/tBuOOBz, [18] etc.) [12] Unfortunately,a ll attempted conditions for the allylic chlorination/bromination (NaClO/CeCl 3 , [13] Ca(ClO) 2 /NaH 2 PO 4, [6] tBuOCl, [14] NBS/ benzyolperoxide, [15] NBS/hv,B r 2 /FeCl 3, [16] etc.)…”

Section: Angewandte Chemiementioning

confidence: 99%

Total Syntheses of Sesterterpenoid Ansellones A and B, and Phorbadione

Zhang

Yao

et al. 2017

Angew Chem Int Ed

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Ansellane-type sesterterpenoids including, ansellones A-G and (+)-phorbadione are structurally novel marine secondary metabolites which exhibit anticancer and anti-HIV activity. The first, asymmetric total syntheses of three structurally representative members, (-)-ansellones A and B and (+)-phorbadione, were accomplished in 16-23 steps from (+)-sclareolide. The route features the first regioselective cyclization of vinyl epoxides with internal alcohol nucleophiles in a 1,4-addition manner (S 2'). Additionally, the allylic C-H oxidation was exploited at a late stage of the synthesis of (-)-ansellone A and (+)-phorbadione. This strategy is expected to be applicable to the synthesis of other ansellane sesterterpenoids.

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“…18 Importantly, at room temperature, the SeO x component of the native oxide is soluble in aqueous bases, whereas the BiO x component is not. 19 Consequently, application of an HSQ EBL process to Bi 2 Se 3 requires removal of SeO x prior to HSQ deposition. This work thus details a reproducible route to the production of high-resolution features on Ge and Bi 2 Se 3 using an HSQ direct-write, negative-tone, EBL process.…”

Section: Introductionmentioning

confidence: 99%