title: A novel structural rearrangement reaction of dialkylated derivatives of [Pt ₂ (μ-S) ₂ (PPh ₃) ₄] involving Pt-C bond formation

authors: Ujam, Oguejiofo Theophilus

abstract: Reaction of [Pt ₂ (μ-S) ₂ (PPh ₃) ₄] with the dialkylating agents ClCH ₂ C(O)CH ₂ Cl or ClCH ₂ C(NNHC(O)NH ₂)CH ₂ Cl gives the dicationic di-μ-thiolate complexes [Pt ₂ {μ-SCH ₂ C(O)CH ₂ S)(PPh ₃) ₄] ²⁺ or [Pt ₂ {μ-SCH ₂ C(NNHC(O)NH ₂)CH ₂ S} (PPh ₃) ₄] ²⁺, isolated as BPh ₄ ⁻ salts and characterised by ESI mass spectrometry, NMR spectroscopy and single-crystal X-ray crystallography. Treatment of the complex [Pt 2{μ-SCH 2C(O)CH 2S)(PPh₃) ₄] ²⁺, which contains a [6.6.4] bicyclic system, with hydroxide ions results in deprotonation of a CH 2 group and rearrangement of the resulting monocation, giving [Pt ₂ (μ-SCH ₂ C(O)CHS}(PPh ₃) ₄] ⁺, isolated as its PF ₆ ⁻ salt. An X-ray structure determination shows the complex to have a novel rearranged [6.5.5] bicyclic system containing a Pt-S-Pt-S-C five-membered ring with a Pt-C bond. The alkyl ligand has a high trans-influence, manifest in a long trans Pt-P bond and small 1J(PtP) coupling constant to the trans PPh 3 ligand. Reaction of [Pt ₂ (μ-S) ₂ (PPh ₃) ₄] with the 2,4-dinitrophenylhydrazone derivative of 1,3-dichloroacetone leads to the closely related complex [Pt ₂ {μ-SCH ₂ C(NNHAr)CHS} (PPh ₃) ₃Cl] [Ar = C ₆H ₃ (NO ₂) ₂] in which a PPh ₃ ligand is substituted by a chloride.

text: A novel structural rearrangement reaction of dialkylated derivatives of [Pt ₂ (μ-S) ₂ (PPh ₃) ₄] involving Pt-C bond formation Reaction of [Pt ₂ (μ-S) ₂ (PPh ₃) ₄] with the dialkylating agents ClCH ₂ C(O)CH ₂ Cl or ClCH ₂ C(NNHC(O)NH ₂)CH ₂ Cl gives the dicationic di-μ-thiolate complexes [Pt ₂ {μ-SCH ₂ C(O)CH ₂ S)(PPh ₃) ₄] ²⁺ or [Pt ₂ {μ-SCH ₂ C(NNHC(O)NH ₂)CH ₂ S} (PPh ₃) ₄] ²⁺, isolated as BPh ₄ ⁻ salts and characterised by ESI mass spectrometry, NMR spectroscopy and single-crystal X-ray crystallography. Treatment of the complex [Pt 2{μ-SCH 2C(O)CH 2S)(PPh₃) ₄] ²⁺, which contains a [6.6.4] bicyclic system, with hydroxide ions results in deprotonation of a CH 2 group and rearrangement of the resulting monocation, giving [Pt ₂ (μ-SCH ₂ C(O)CHS}(PPh ₃) ₄] ⁺, isolated as its PF ₆ ⁻ salt. An X-ray structure determination shows the complex to have a novel rearranged [6.5.5] bicyclic system containing a Pt-S-Pt-S-C five-membered ring with a Pt-C bond. The alkyl ligand has a high trans-influence, manifest in a long trans Pt-P bond and small 1J(PtP) coupling constant to the trans PPh 3 ligand. Reaction of [Pt ₂ (μ-S) ₂ (PPh ₃) ₄] with the 2,4-dinitrophenylhydrazone derivative of 1,3-dichloroacetone leads to the closely related complex [Pt ₂ {μ-SCH ₂ C(NNHAr)CHS} (PPh ₃) ₃Cl] [Ar = C ₆H ₃ (NO ₂) ₂] in which a PPh ₃ ligand is substituted by a chloride.

year: 2012

title: Abstracts of the 7th International Conference on Lactoferrin / Résumés de la 7e Conférence internationale sur la lactoferrine

authors: Thomson, N.A.

subjects: lactoferrins

abstract: The article presents abstracts on lactoferrin research. They include "Oral administration of lactoferrin raises NK cell activity in mice,"Comparison of antimicrobial activity between lactoferricin B 15 derivative and antibiotics" and "Batch extraction of lactoferrin from raw whole milk."

text: Abstracts of the 7th International Conference on Lactoferrin / Résumés de la 7e Conférence internationale sur la lactoferrine The article presents abstracts on lactoferrin research. They include "Oral administration of lactoferrin raises NK cell activity in mice,"Comparison of antimicrobial activity between lactoferricin B 15 derivative and antibiotics" and "Batch extraction of lactoferrin from raw whole milk."

year: 2006-06

title: Sweet as – the [ADJ + as] intensifier construction in Māori English/ Aotearoa English.

authors: Calude, Andreea S.

abstract: We introduce the Waikato Māori English Conversation (MEC) corpus, which consists of 43 dyadic conversations between 49 young adults who self-recorded informal conversations with close friends, in their own homes, with no topic of conversation specified (83 hours of dialogue; nearly 800,000 words). The resulting materials are colloquial and unstructured, capturing a wider range of pragmatic and stylistic modes than is possible in a standard sociolinguistic interview. Here, we report on one such feature, the [ADJ + as] construction, for example: ‘sorry some of the questions are like awkward as’ and ‘that caused a big as drama eh’. This intensifier construction has been identified as a distinctive New Zealand English (NZE) innovation, yet little has been written about this it. However, the Waikato MEC corpus presents the opportunity to analyse the construction in a more systematic manner and to fill existing gaps in analyses of Māori English grammar.

text: Sweet as – the [ADJ + as] intensifier construction in Māori English/ Aotearoa English. We introduce the Waikato Māori English Conversation (MEC) corpus, which consists of 43 dyadic conversations between 49 young adults who self-recorded informal conversations with close friends, in their own homes, with no topic of conversation specified (83 hours of dialogue; nearly 800,000 words). The resulting materials are colloquial and unstructured, capturing a wider range of pragmatic and stylistic modes than is possible in a standard sociolinguistic interview. Here, we report on one such feature, the [ADJ + as] construction, for example: ‘sorry some of the questions are like awkward as’ and ‘that caused a big as drama eh’. This intensifier construction has been identified as a distinctive New Zealand English (NZE) innovation, yet little has been written about this it. However, the Waikato MEC corpus presents the opportunity to analyse the construction in a more systematic manner and to fill existing gaps in analyses of Māori English grammar.

year: 2025